. The number of cars sold per day at a local car dealership, along with its corresponding probabilities, is shown in

the succeeding table. Compute the mean, variance and the standard deviation of the probability distribution by

following the given steps. Interpret the results.

2. The number of items sold per day at a retail store, with its corresponding probabilities, is shown in the table. Find

the mean, variance and standard deviation of the probability distribution. Interpret the results.

X

0

1

2

3

4

P(X)

1/10

2/10

3/10

3/10

1/10

X

0

1

2

3

4

P(X)

1/10

2/10

3/10

2/10

2/10

X

19

20

21

22

23

P(X)

0.20

0.20

0.30

0.20

0.10
​