Question: = Question 2 of 11 (6 points) | Question Attempt: 1 of 1 Time Remaining: 1:33:13 Smartphones: A poll agency reports that 47% of teenagers

= Question 2 of 11 (6 points) | Question Attempt: 1 of 1 Time Remaining: 1:33:13 Smartphones: A poll agency reports that 47% of teenagers aged 12-17 own smartphones. A random sample of 147 teenagers is drawn. Round your answers to at least four decimal places as needed. Part 1 of 6 (a) Find the mean un. The mean JA is 0.4700 X Part: 1 / 6 Part 2 of 6 (b) Find the standard deviation on. The standard deviation on is X

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