1- At a cell phone assembly plant, 77% of the cell phone keypads pass inspection. A random sample of 98 keypads is analysed. Find the mean μ

0.77

0.23

0.043

0.96

2- For a particular diamond mine, 80% of the diamonds fail to qualify as "gemstone grade". A random sample of 113 diamonds is analyzed. Find the standard deviation σ

0.96

0.20

0.80

0.038

3- If P(A) = 0.76, P(B) = 0.4, and P(A and B) = 0.27, find P(A or B).

0.27

0.135

0.58

0.89

For a particular diamond mine, 80% of the diamonds fail to qualify as "gemstone grade". A random sample of 113 diamonds is analyzed. Find the standard deviation σ

0.96

0.20

0.80

0.038