Question

Suppose 20% of book readers say that mystery is their favorite genre. If a random sample of 120 book readers is taken, what are the mean and standard deviation of the number of book readers that prefer mystery?

μ=43.2,σ=19.200
μ=24.0,σ=3.4600
μ=24.0,σ=4.3818
μ=0.20,σ=3.4600

Answer 1

The mean and standard deviation of the number of book readers that prefer mystery are 24 and 3.4600, respectively.

Step-by-step explanation:

To find the mean and standard deviation, you can use the formulas:

Mean (μ) = sample size * probability = (120)(0.20) = 24

Standard Deviation (σ) = √(sample size * probability * (1 - probability)) = √((120)(0.20)(0.80)) = 3.4600