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# It has been estimated that only about 30% of California residents have adequate earthquake supplies.

**106**It has been estimated that only about 30% of California residents have adequate earthquake supplies. Suppose we are interested in the number of California residents we must survey until we find a resident who does **not** have adequate earthquake supplies.

a) In words, define the random variable X.

b) List the values that X may take on.

c) Give the distribution of X. X ~ _____(_____,_____)

d) What is the probability that we must survey just one or two residents until we find a California resident who does not have adequate earthquake supplies?

e) What is the probability that we must survey at least three California residents until we find a California resident who does not have adequate earthquake supplies?

f) How many California residents do you expect to need to survey until you find a California resident who **does not** have adequate earthquake supplies?

g) How many California residents do you expect to need to survey until you find a California resident who **does** have adequate earthquake supplies?