INSTRUCTOR SOLUTION MANUAL FOR ELEMENTARY STATISTICS 2 PRACTICE TEST 2026 FULL SOLUTIONS REVIEW PACK

INSTRUCTOR SOLUTION MANUAL FOR
ELEMENTARY STATISTICS 2 PRACTICE TEST
2026 FULL SOLUTIONS REVIEW PACK

◉ Solve the problem.


For the following data set, approximate the sample standard
deviation of phone calls per day.


8-11 18
12-15 23
16-19 38
20-23 47
24-27 32


2.9
18.8
3.2
5.1
Answer: 5.1

,◉ Solve the problem.


Find the range of the data set represented by the graph.


20


15


10


5


01234567


a) 20
b) 17
c) 6
d) 5
Answer: c) 6


◉ Solve the problem.

,Find the z-score for the value 70, when the mean is 76 and the
standard deviation is 2.


z= -.89
z= -3.00
z= .89
z= -3.50
Answer: z= -3.00


◉ Solve the problem.


The average IQ of students in a particular calculus class is 110, with
a standard deviation of 5. The distribution is roughly bell-shaped.
Use the Empirical Rule to find the percentage of students with an IQ
above 120.


2.5%
11.15%
15.85%
13.5%
Answer: 2.5%


◉ Solve the problem.

, The ages of 10 grooms at their first marriage are listed below. Find
the midquartile.


35.1 24.3 46.6 41.6 32.9 26.8 39.8 21.5 45.7 33.9


43.7
34.5
34.1
34.2
Answer: 34.2


◉ Solve the problem.


For the mathematics part of the SAT the mean is 514 with a standard
deviation of 113, and for the mathematics part of the ACT the mean
is 20.6 with a standard deviation of 5.1. Bob scores a 660 on the SAT
and a 27 on the ACT. Use z-scores to determine on which test he
performed better.


ACT
SAT
Answer: SAT