Question

The heights of adult men in America are normally distributed,
with a mean of 69.4 inches and a standard deviation of 2.66 inches.
The heights of adult women in America are also normally
distributed, but with a mean of 64.1 inches and a standard
deviation of 2.55 inches.

a) If a man is 6 feet 3 inches tall, what is his z-score (to two
decimal places)?

z =

b) What percentage of men are SHORTER than 6 feet 3 inches? Round
to nearest tenth of a percent.

%

c) If a woman is 5 feet 11 inches tall, what is her z-score (to two
decimal places)?

z =

d) What percentage of women are TALLER than 5 feet 11 inches? Round
to nearest tenth of a percent.

%

Answer #1

a)

Here, μ = 69.4, σ = 2.66 and x = 75

The corresponding z-value is calculated using Central Limit
Theorem

z = (x - μ)/σ

z = (75 - 69.4)/2.66 = 2.11

b)

P(X <= 75) = P(z <= (75 - 69.4)/2.66)

= P(z <= 2.11)

= 0.9826

c)

Here, μ = 64.1, σ = 2.55 and x = 71. We need to compute P(X >=
71). The corresponding z-value is calculated using Central Limit
Theorem

z = (x - μ)/σ

z = (71 - 64.1)/2.55 = 2.71

d)

P(X >= 71) = P(z <= (71 - 64.1)/2.55)

= P(z >= 2.71)

= 1 - 0.9966 = 0.0034

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