Question

rhe average height of men in the united states is 70inch with a standard deviation of 4 inches. what proportion of men are 67 inches or taller?

A) .7500

B) .2500

C) .7734

D) .2266

Answer 1

Solution :

Given that ,

mean = = 70

standard deviation = = 4

P(x 67) = 1 - P(x   67)

= 1 - P[(x - ) / (67-70) /4 ]

= 1 -  P(z -0.75 )  

= 1- 0.2266 = 0.7734

Probability = 0.7734

c) .7734 option correct answer