Posted by **Phyllis** on Thursday, June 17, 2010 at 4:36pm.

A survey found 70% of adults over 50 wear glasses. In a random sample of 10 adults over 50, what is the probability that exactly six wear glasses and at least six wear glasses

- statistics -
**PsyDAG**, Thursday, June 17, 2010 at 6:24pm
The probability of all events occurring is found by multiplying the probabilities of the individual events.

.7^6 * .3^4 = ? (exactly six)

Add probabilities of 6, 7, 8, 9 and 10 for "at least."

e.g., for 10 wearing = .7^10 = ?

for 9 wearing = .7^9 * .3 =?

I'll let you do the remaining calculations.

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