Women have head circumferences that are normally distributed with a mean given by
mu equals 23.41 inμ=23.41 in.,
and a standard deviation given by
sigma equals 0.7 inσ=0.7 in.
Complete parts a through c below.
a. If a hat company produces women's hats so that they fit head circumferences between
22.822.8
in. and
23.823.8
in., what is the probability that a randomly selected woman will be able to fit into one of these hats?The probability is
nothing.
(Round to four decimal places as needed.)
b. If the company wants to produce hats to fit all women except for those with the smallest
3.753.75%
and the largest
3.753.75%
head circumferences, what head circumferences should be accommodated?The minimum head circumference accommodated should be
nothing
in.The maximum head circumference accommodated should be
nothing
in.
(Round to two decimal places as needed.)
c. If
55
women are randomly selected, what is the probability that their mean head circumference is between
22.822.8
in. and
23.823.8
in.? If this probability is high, does it suggest that an order of
55
hats will very likely fit each of
55
randomly selected women? Why or why not? (Assume that the hat company produces women's hats so that they fit head circumferences between
22.822.8
in. and
23.823.8
in.)The probability is
nothing.
(Round to four decimal places as needed.)
If this probability is high, does it suggest that an order of
55
hats will very likely fit each of
55
randomly selected women? Why or why not?
A.Yes, the probability that an order of
55
hats will very likely fit each of
55
randomly selected women is
0.86880.8688.
B.No, the hats must fit individual women, not the mean from
55
women. If all hats are made to fit head circumferences between
22.822.8
in. and
23.823.8
in., the hats won't fit about
13.1213.12%
of those women.
Women have head circumferences that are normally distributed with a mean given by mu equals 23.41...
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