Chapter 9 Review
Game
Question 1
 On
a scale of 1 to 10, ratings about
school cafeteria food have a mean
of 4.2 and a standard deviation of
1.6. If you take a random sample of
60 students, what is the probability
that their mean rating for cafeteria
food will be less than 4.0?
Question 2
 Over
the course of his career, Mr. Cilento
has been rated by the students on a scale
from 1 to 10. His average rating is a 6.3
with a standard deviation of 2.2. If 5
students are selected at random, what is
the probability that their average rating
will be between 5.8 and 6.5?
Question 3
 PARCC
scores for all 750 Geometry
students in Woodbridge Township vary
according to a Normal Curve with a mean
of 3.18 and standard deviation of .60. If
you take a Woodbridge Geometry
student at random, what is the probability
his/her PARCC score will be greater than
3.5?
Question 4
 Nationwide,
42% of adults refer to the
living room piece of furniture that one
sits on as a sofa. Describe the
sampling distribution of p-hat….the
proportion of people in a sample of
300 who call the piece of furniture a
sofa.
Question 5
 In
a survey given to his AP Statistics classes
this year, 62% of students approve of Mr.
Seavy’s teaching methods. If you take a
random sample of 30 of Mr. Seavy’s
students, what is the probability that the
proportion who approve of his teaching
methods will be greater than .65?
Question 6
 Currently,
President Obama’s approval
rating stands at 41%. If you take a random
sample of 500 American adults, what is the
probability that the proportion of people
in the sample who approve of the
President’s job performance is between
.40 and .42?
Question 7
 Suppose
the heights of adult women
vary according to the Normal
distribution with mean 64.5 and
standard deviation 2.5. If 5 women
are selected, what is the probability
that exactly 2 of them will have
heights below 63 inches?
Question 8
 Suppose
the heights of adult men
vary according to the Normal
distribution with mean 70.5 and
standard deviation 3.5. If 2 men are
selected, what is the probability that
at least one of them will have a
height above 75 inches?
Question 9
 Suppose
the heights of adult men
vary according to the Normal
distribution with mean 70.5 and
standard deviation 3.5. What height
represents the 80th percentile of
men’s heights?
Question 10
 Suppose
the heights of adult men vary
according to the Normal distribution with
mean 70.5 and standard deviation 3.5.
On average, how many tries would it take
to randomly select a male under 62 inches
tall? Round your answer to the nearest
whole number.