Answer Happy

Use the information below to answer the following TWO
questions:
Suppose that a national charity organisation is seeking
donations by telephone. They estimate that for any individual
contacted by phone, the probability is 0.05 that the person will
make an immediate donation. Suppose that a volunteer operator
successfully contacts 10 potential donors, and that the outcomes of
the calls can be assumed to be independent.
7. What is the probability that none of the 10 people
contacted make a donation?
1. 0.0
2. 0.05
3. 0.5157
4. 0.5987
8. What is the probability that at least two of the ten people
contacted make a donation?
1. 0.0115
2. 0.0861
3. 0.9139
4. 0.9885
9. Suppose that X is the amount of cola (in mls) dispensed into
a can. If X uniformly distributed over the interval 350 to
360, inclusively (350  X  360), then the P(352.5  X  357.5)
is
__________________.
1. 0.250
2. 0.333
3. 0.500
4. 1.000
10. Suppose that X is a binomial random variable with n = 200
and p = 0.2. What is the mean of X?
1. 2
2. 4
3. 20
4. 40