1/If 30% of the people in a community use the library in one year, find the probability that in a random sample of 10 people

(a) At most 4 use the Library.

(b) No fewer than 8 use the Library.

(d) Compute the expected number and standard deviation of people who use the library.

2/The probability of having a defective phone in an office is 45%. If a sample of 11 phones are selected, find the probability that:

(a) Less than 3 of them are defective.

(b) At least 8 of them are defective.

(c) Compute the expected number and standard deviation of defective phone.