ASAP 3 Quistions in (introduction statistic)

CAN YOU SOLVE 3 QUESTIONS IN STATISTIC LESS THAN 10 MINUTE

1. A sample of 75 students at "A College" shows that they spend on the average

13.6 hrs/wk on the Face Book with a standard deviation of 2.9 hours. Using

Chebyshev’s Theorem, determine at least how many of these students spend between

6.35 and 20.85 hours per week on the Face Book . 

2. An airport is studying the noise levels of jets during takeoff as they pass over a [3]

neighborhood. They find that at the present time the mean noise level is 103 decibels

and the standard deviation is 5.4 decibels. Assuming empirical rule as appropriate,

find the approximate percentage of these jets have a noise level of

a. between 92.2 and 119.2 decibels?

b. between 97.6. and 108.4 decibels?

c. What proportion of these jets have a noise level of 86.8 decibels or less when

taking off over this neighborhood?

3. Find a box and whisker plot for the following data set. [4]

[ Use the five point summary as discussed in class. ]

22, 14, 17, 4, 12, 9, 16, 2, 19, 15, 10, 29, 7, 18, 8