Standard deviation?

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Could you solve this example problem for me? I don't know how to do it.

A survey found that 30% of older Americans have given up driving. If a sample of 1500 older Americans is taken, the standard deviation of the sample is___.

Thank you for your help.

2007-05-03 07:38:36 · 2 answers · asked by ? 4 in Science & Mathematics ➔ Mathematics

2 answers

Standard deviation of a binomial distribution is √(np(1-p)), which in this case is √(1500*.7*.3) = √315 ≈ 17.748

2007-05-03 08:10:31 · answer #1 · answered by Pascal 7 · 0⤊ 0⤋

Could be 38.7 but I am not sure.
That is the square root of 1500.

2007-05-03 14:56:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋