10-30-17 Stats Ch3&4 Test Review 2016.notebook
Transcript of 10-30-17 Stats Ch3&4 Test Review 2016.notebook
103017 Stats Ch3&4 Test Review 2016.notebook
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November 01, 2017
Permutations Combinations
places prizes rank
rearrange arrange
Order matters Order does not matterfood choices
choose a small group from a larger group
Careful: locker combinations are not named properly. They should be locker permutations
7P4 7c4 Factorial
Method's of counting.Counting principle
Choose a certain amount from each category.
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2) Describe the following probabilities as simplified fractions if you pick one card from a standard 52 card deck.
a. What is the probability that the card is the 7 of diamonds?
b. What is the probability that the card is a diamond?
c. What is the probability that the card is a even number or a face card?
d. What is the probability that the card is an ace given that it is a heart?
e. What is the probability that the card is an even number and red?
152
pull
pull 1352
14=
pull 2052 + 12
52 052
= 3252
813=
pull 113
pull 526
just visualize the sample space and count the cards that fit the discription
2052note
pull: think of sample space and count
3) Describe the following probabilities as simplified fractions if you pick two cards from a standard 52 card deck and1) Replace the first card and shuffle before picking the second card.2) Do not replace the first card before picking the second card. a. What is the probability that the first card is a heart and the second card is a black card?
b. What is the probability that both cards are diamonds?
c. What is the probability that first card is a black card and the second card is a red card?
d. What is the probability that both cards are aces?
1) With replacement: 2) Without replacement:
1) With replacement: 2) Without replacement:
1) With replacement: 2) Without replacement:
1) With replacement: 2) Without replacement:
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pull
pull
4) Find the total number of outcomes in each scenario.
a. In my game there are 10 numbers in a bowl. How many different ways can the numbers be arranged if 4 numbers are drawn from a bowl and placed in order on a table?
b. For a study, 5 people are chosen at random from a group of 12 people. How many ways can this be done?
c. You order a pizza from the shop down the street. They have 16 different toppings but you only want three. How many different pizzas can you have with three toppings?
math set up:Permutation or combination answer:
math set up:Permutation or combination answer:
math set up:Permutation or combination answer:
5. You have 5 posters. Each poster has one letter on it. The letters spell out BEARS if they are in the correct order. If you pass them out randomly to the 5 students in the front row and ask them to show the letter on their sign on the count of 3. What is the probability that they will spell the word correctly?
10P4
12c5
16c3 560pull
5P5 = 5! 5(4)(3)(2)(1) = 120 answer: 1/120
6) At Hopewell Electronics, all 140 employees were asked about their political affiliation. The employees were grouped by type of work, as executives or production workers.
Employee Political Affiliation RowType Dem.(D) Rep.(R) Ind.(I) TotalsExecutive (E) 5 34 9 48Prod. Workers 63 21 8 92totals 68 55 17 140
What is the probability that a randomly selected individual is:a. a Independent?
b. an independent or an executive?
c. a democrat given that the person is a production worker?
d. A republican and a production worker.
e. not an independent?
17/140pull
2/5pull
63/92pull
21/140pull
123/140pull
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Nate wants to get his drivers license. He must take two tests. Records of past candidates indicate that the probability of passing the written exam is .87. The probability that the candidate passes the driving portion is .79. What is the probability that Nate passes both tests.
(.87)(.79) = .6873 = 69%pull
Age 1620 2125 2630 3135 3640
Frequency 35 30 15 22 6
Horseback riding lessons. The following table shows the ages of a random sample of people that signed up for horseback riding lessons in the past year
Find the sample mean and sample standard deviation for the grouped data. Round to the thousandths place. Step 1: find the midpoints for each group.
Step 2: Put the midpoints into list one and put the frequencies into list 2
Step 3: Do 1Varstat L1, L2
Step 4: choose the correct symbols for sample and round correctly
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November 01, 2017
All applicants that apply for the job will be rated from 15 in each category. The categories are each weighted differently based on importance.
Appearance is weighted 6, attitude is weighted 9, promptness is weighted 7, and workethic is weighted 8.
My scores were 5 for promptness, 4 for attitude, 3 for workethic and 2 for appearance. Find my weighted average to the nearest thousandth.
appearance
attitude
promptness
workethic
6( ) + 9( ) + 7( ) + 8( )
6 + 9 + 7 + 8
2 4 5 3 10730
= 3.567pull
The following scores are ALL the SAT scores from Mrs. Cohen's PreCalculus class:
1000 1200 700 1200 1300 2000 2250 1400
1250 2200 1450 1400 1700 1650 1850 1750
1900 2000 1850 1350 1900 2000 1850 1700
2200 1850 1900
Find the following: Round to three decimal places. (the thousandths place)
b) Find a 88.9% Chebyshev’s Interval : Show steps!
a) Mean _______ Median _______Mode _______Standard deviation _______
pull:
keep the data in your calculator
1750 1850answers:
calculator shows:
1659.2593(382.980) 1659.2593(382.980)pull:
510.319 2808.199pull
NOTE: use the rounded numbers from part a to answer part b.
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c) If Sam's SAT score was the 1250, what percentile was he in? Show steps!
pull for answers 5th in the list of 27: 5/27 = .185185 = 18.519 the percentile5th in the list 5/27 = .1851851852 (100) = 18.5 percentile
d) The person that scored in the 80th percentile got what raw score? Show steps!
70th percentile = .80 (27) = 21.6 means find the 22nd score in the list = 2000pull 80 / 100 = .80 (27) = 21.6 find the 22nd number in the list. 2000
h) Find a 8% trimmed mean of the SAT scores: Show steps!
8% of 27 is = (.08)(27) = 2.16 remove the 2 smallest and 2 largest numbers from the list and recalculate the mean.
pull:
e) find the 5 number summary of the SAT scores and make a box and whisker. Find the IQRMin 700 Q1 = 1350 Med = 1750 Q3 = 1900 Max = 2250pull: IQR = 550
700
900
1300
1700
1100
1500
1900
2100
2300
700 1350
1750
1900
2250
PULL
pull: 1680.435
pull: IQR = 19001350 = 550
g) Is the data skewed right, skewed left or symmetrical?skewed left. The distance from the median to the min is longer than the distance from the median to the max
pull:
f) Find the fences for the outliers.Q1 1.5(IQR) Q3 + 1.5(IQR)1350 1.5(550)
5251900 + 1.5(550)
2725
pull:
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I Used the data to create a histogram with 4 classes.
i) Explain the steps to find the mean of the group data in the above problem. What do you put in your calculator –and where do you put it.
f). create a frequency table below
700
1088
1476
1864
2252
1087
1863
2251
e. show how to find the class width: largest smallest # of classes
893.5
1281.5
1669.5
2057.5
246810
2
8 89
h) Use the histogram to describe the distribution of the data.
bump up to next integer = 388pull:
skewed left pull
NOTE: you do not have to make a histogram for me on the test.
Put the midpoints into List1 and the frequencies into List2. Do 1Varstat L1,L2. Remember this was ALL of the SAT scores.
pull
1626.389pull:
j) what is the mean of the grouped data?
The menu has 3 types of salads, 4 entrees, 6 drinks and 4 desserts to choose from. The special allows you to choose one of each. How many different lunch specials are there?
salads entrees drinks desserts
3 4 6 4 = 208pull
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1) The following data give the ages of a random sample of 50 drivers arrested while driving under the influence of alcohol.
a) Make a frequency table using 5 classes.
b) Make a histogram showing class boundaries.
c) Make a relative frequency histogram of the data.
46 16 41 26 22 33 30 22 36 34
63 21 26 18 27 24 31 38 26 55
31 47 27 43 35 22 64 40 58 20
49 37 53 25 29 32 23 49 39 40
24 56 30 51 21 45 27 34 47 35
12
17
9
8
4
freq. pull
.10
.20
.30
.40
pull
mean of all 50 numbers
1Var Stat L1,L2
mean of grouped data.
class width (64 16)
pull
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