Smartphones:A poll agency reports that

37

%

of teenagers aged

12

17

own smartphones. A random sample of101

teenagers is drawn. Round your answers to at least four decimal places as needed.

Part 1 of 6

(a) Find the mean

p

.The mean

p

is37.37

.

Part 2 of 6

(b) Find the standard deviation

p

.The standard deviation

p

is4.8521

.

Part:2 / 6

2 of 6 Parts Complete

Part 3 of 6

(c) Find the probability that more than40

%

of the sampled teenagers own a smartphone.The probability that more than40

%

of the sampled teenagers own a smartphone is0.2662

.

Part:3 / 6

3 of 6 Parts Complete

Part 4 of 6

(d) Find the probability that the proportion of the sampled teenagers who own a smartphone is between0.34

and0.48

.The probability that the proportion of the sampled teenagers who own a smartphone is between0.34

and0.48

is

.