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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