A survey found that women's heights are normally distributed with mean
62.2
in. and standard deviation
3.2
in. The survey also found that men's heights are normally distributed with mean
67.2
in. and standard deviation
3.5
in. Most of the live characters employed at an amusement park have height requirements of a minimum of
55
in. and a maximum of
62
in. Complete parts (a) and (b) below.
a. Find the percentage of men meeting the height requirement. What does the result suggest about the genders of the people who are employed as characters at the amusement park?
The percentage of men who meet the height requirement is what %?
(Round to two decimal places as needed.)
b. If the height requirements are changed to exclude only the tallest 50% of men and the shortest 5% of men, what are the new height requirements?
The new height requirements are a minimum of height and maximum height?
Solution:
women's height
mean 62.2 in.
standard deviation 3.2 in
men's heights
mean 67.2 in.
standard deviation 3.5 inches
a) probability that a man meets the height requirements
b)
Z score in the normal probability table in the appendis that corresponds with a probability of 0.05 and 0.50
z= -1.645
z= 0
x = µ + z σ = 67.2 + (-1.645)*3.2 = 61.936
x = µ + z σ = 67.2 + 0*3.2 = 67.2
The smallest 5 % have height below 61.936
largest 50% have height 68.6 inches
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