Explaining probability distribution of data

Reference no: EM1319518

Q1) Statistics department is contacting alumni by telephone asking for donation to help fund new computer laboratory. Past history illustrates that 40% of alumni contacted in this manner will make a contribution of at least $100. A random sample of 20 alumni is selected. Let X represents number of alumni which makes at contribution of at least $100.

a) Explain probability distribution of X (name and parameters).

b) Determine the probability that exactly 9 alumni will make contribution of at least $100?

c) Find out the probability that at least 9 alumni will make contribution of at least $100?

d) How many alumni would you expect to make a contribution of at least $100?

Determine the probability that at least 9 but not more than 12 will make a contribution of at least $100?

Reference no: EM1319518

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