Use the probability distribution to complete parts(a) and(b) below.

The number of defects per 1000 machine parts inspected

Defects

0

1

2

3

4

5

Probability

0.266

0.284

0.245

0.151

0.040

0.014

(a) Find themean, variance, and standard deviation of the probability distribution.

The mean is

nothing

.

(Round to one decimal place asneeded.)