____
7.
The
sample variance
of the data {2, 4, 6, 8, 10} is 10.
a.
The
sample standard deviation
of the data {1, 2, 3, 4, 5} is 5
b.
The
sample standard deviation
of the data {2, 4, 6, 8, 10} is 5
c.
The
sample variance
of the data {4, 8, 12, 16, 20} is 20
d.
The
sample variance
of the data {4, 8, 12, 16, 20} is 40
____
8.
The average price of personal computers manufactured by MNM Company is $1,200 with a standard
deviation of $200. Furthermore, it is known that the computer prices manufactured by MNM are normally
distributed. Computers with prices of more than $1,550 receive a discount. If 10 computers were randomly
selected, what is the probability that more than 2 computers receiving discount?
a.
4.00%
b.
0.40%
c.
1.31%
d.
0.62%
____
9.
A population is normally distributed with a mean of
μ
and a standard deviation of 4.
If a sample of size 16 is
selected from this population, what is the probability that the sample mean will be within ±2 of the population
mean?
a.