In a math class of 32 students to construct the following probability distribution.The table lists the number of people absent on an exam day and its assigned probability.

X P(X)

1 0.15

2 0.25

3 0.2

4 0.15

5 0.05

6 0.1

7 0.05

8 0.05

a)What is the probability that between 3 and 5 students, inclusive, are absent on exam day?

b)On average how many students would you expect to be absent on an exam day?

2)A software company sells software on the Internet.The number of unsolicited sales follows a Poisson distribution with a mean of 5 sales per day.What is the probability the company makes at least 1 sale in one day?