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	0.263	0.294	0.230	0.156	0.040	0.017

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Part 1

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

The mean is

enter your response here.

(Round to one decimal place as needed.)