A Company Sells Light Bulbs in Packages of 20 and Estimates

Multiple Choice

A company sells light bulbs in packages of 20 and estimates that the mean number of defective light bulbs in a package is 0.6 with a standard deviation of 0.7.If a customer buys 12 packages,what are the expected value and standard deviation of the number of defective light bulbs? Assume that packages are independent of each other.

A) μ = 7.2,σ = 2.42
B) μ = 7.2,σ = 100.8
C) μ = 2.08,σ = 8.4
D) μ = 7.2,σ = 8.4
E) μ = 2.08,σ = 2.42