In a certain town 40 of the people work for the federal

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In a certain town, 40% of the people work for the federal government. The table shows the probability distribution for the number of adults (among 4  randomly chosen) who work for the federal government. Note the last column shows the cumulative probabilities.

x

P(x)

Cumulative Probability

0

0.1296

0.1296

1

0.3456

0.4752

2

0.3456

0.8208

3

0.1536

0.9744

4

0.0256

1.0000

a. Find the probability that exactly 3 people work for the government.   

b. Find the probability that less than 4 work for the government.   

c. Find the probability that at least 2 work for the government.            

d. Find the standard deviation for the probability distribution. (round to 2 decimal places)     

e. Find the expected value for the number of people who work for the govt.

Reference no: EM13636291

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