If the population proportion is 0.90 and a sample of size 64 is taken,what is the probability that the sample proportion is more than 0.89?
A) 0.1064
B) 0.2700
C) 0.3936
D) 0.6064
E) 0.9000

Question

Quizplus · Accepted Answer

The sample proportion follows a normal distribution with mean 0.90 and standard deviation sqrt((0.90*0.10)/64). Using the z-score formula, we find the probability that the sample proportion is more than 0.89, which corresponds to choice D.

If the Population Proportion Is 0