Question: (b) Find the standard deviation .The standard deviation is . Smartphones: A poll agency reports that 75% of teenagers aged 12-17 own smartphones. A random

(b) Find the standard deviation .The standard deviation is .

Smartphones: A poll agency reports that 75% of teenagers aged 12-17 own smartphones. A random sample of 234 teenagers is drawn. Round your answers to four decimal places as needed. Part 1 of 6 (a) Find the mean pA. P The mean A is 'F' p Part: 1 /6 @l Part 2 of 6 (b) Find the standard deviation oA r The standard deviation oA is ' 0.0254(?. ( ' p

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