Solution :
Given that ,
p = 0.42
1 - p = 0.58
n = 400
= p = 0.42
= (p*(1-p))/n = (0.42*0.58)/400 = 0.02468
P( 0.375) = 1 - P( < 0.375)
= 1 - P(( - ) / < (0.375-0.42) /0.02468 )
= 1 - P(z < -1.82)
= 1 - 0.0344 using z-table.
= 0.9656
Probability = 0.9656
A market research firm conducts telephone surveys with a 42% historical response rate. What is the probability that in...
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