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Statistics Midterm
Test Description: Mean, quartiles, probability, normal distribution
Instructions: Answer all questions to get your test result.
1) Find the mean: 2, 2, 4, 6, 7, 9, 10, 11, 15
A
7.3
B
5.9
C
3.5
D
9.7
2) Find the quartiles: 2, 2, 4, 6, 7, 9, 10, 11, 15
A
Q1 = 3, Q2 = 6, Q3 = 10.5
B
Q1 = 2, Q2 = 7, Q3 = 11
C
Q1 = 3, Q2 = 7, Q3 = 11
D
Q1 = 3, Q2 = 7, Q3 = 10.5
3) In a bag of marbles, there are 3 red marbles, 5 blue marbles, and 1 yellow marble. What is the probability of choosing a blue marble?
A
0.56
B
0.33
C
0.78
D
0.11
4) Does choosing 3 sandwich toppings out of 7 options involve a combination or permutation?
A
neither
B
don't choose this one
C
combination
D
permutation
5) How many different ways can you choose 3 sandwich toppings out of 7 options?
A
210
B
21
C
3500
D
35
6) Let X = number of die rolls it takes to roll a 4. Is X a binomial variable?
A
no
B
yes
C
idk
D
what's a variable?
7) Let X = number of die rolls it takes to roll a 4. Is X a geometric variable?
A
geometric? I thought this was stats
B
yes
C
idk
D
no
8) A set of data with a mean of 17 and standard deviation of 5 is normally distributed. What two values do 99.7% of the data lie between?
A
2-32
B
none
C
7-27
D
12-22
9) A set of data with a mean of 17 and standard deviation of 5 is normally distributed. Find the z-score for 30.
A
-3.4
B
0.8
C
-1.2
D
2.6
10) A set of data with a mean of 17 and standard deviation of 5 is normally distributed. Find the z-score for 11.
A
0.8
B
-1.2
C
-3.4
D
2.6
*select an answer for all questions
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