statistics math homeowork

attached is the assignemnt i need help answering. 

QNT 351

(show your work

Name:

QNT 351
2

1- If samples are from a normal distribution with ( = 100 and ( = 10 we expect
(20 pts)

A) about 68 percent of the data within 90 to 110.

B) almost all the data within 70 to 1

30

.

C) about 95 percent of the data within

80

to 120.

D) all of the above.

2- A probability distribution (20 pts)

A) is a listing of all possible values of a random variable.

B) is a listing of all possible values of a random variable, along with their probabilities.

C) can assume values between -1 and +1.

D) has none of the above properties.

3-The following box plot is based on a recent study on daily charges for a hospital semiprivate room in Louisiana.

A) Based on the plot, what is the interquartile range, and what does it mean? (10 pts)

B) Based on the plot, estimate inner and outer fences. (10 pts)

C) Based on the plot, what are the mild and extreme outliers? (10 pts)

4-Sam is taking two courses, geography and statistics. The probability that she will pass the geography course is 0.65, and the probability of passing the statistics course is 0.75. The probability of passing both is 0.57. What is the probability of passing at least one of these two courses? (20 pts)

Use the following to answer 6 – 8

This table shows a cross-tabulation of employee age versus absenteeism during January at the Zarthan Company.

Absences	Age
Under 25 (A)	25 or More (B)
Under 2 days (C)	50	40
2 or more days (D)	30	80

6- What is the probability of A and C? (20 pts)

7- What is the probability of selecting C given A has happened? (20 pts)

8- What is probability of selecting A given D has happened? (20 pts)