Question

suppose that for adults the average amount of time spent watching tv per day is normally distribution with a mean of 42 minutes and a standard devation of 12 minutes.

1) what percent of adults spend less than 30 minutes watching tv per day?

A) .04 B) .08 C) .11 D) .13 E) .16

2) What percent of adults more than 50 minutes watching tv per day?

A) 0.18 B) 0.25 C) 0.45 D) 0.62 E) 0.75

3) what percent of adults spend between 40 and 60 minutes watching tv per day?

A) 0.23 B) 0.37 C)0.50 D) 0.63 E) 0.82

4) if you watch more tv than 90% of adults, how much would you watch? of watching is at the 90th percentile.

A) 27.7 B) 45.9 C) 52.8 D) 55.2 E) 57.4

5) if a random sample of 25 adults is taken, what is the probability that their saw more than 45 minutes watched?

A) 0.29 B) .35 C) .40 D) .45 E) .52

Answer 1