PLEASE HELP 1 What type of random variable has a set of poss

PLEASE HELP!

1. What type of random variable has a set of possible values which is a collection of isolated points on the number line?

Select one:

a. continuous random variable

b. discrete random variable

c. any random variable

d. most random variables

2. A study of the weekly car sales from last year resulted in the following information. Only once did the dealership sell no cars in a week. Three times they sold only 1 car, five times they sold 2 cars, eight times they sold 3 cars, they never sold 4 cars, eleven times they sold 5 cars, twenty times they sold 6 cars, they never sold 7 cars, three times they sold 8 cars and one time they sold 9 cars.

Find the probability that at most 4 cars were sold in a week.

Select one:

a. 0.123

b. 17/52

c. 12/52

d. 16/52

3. A study of the weekly car sales from last year resulted in the following information. Only once did the dealership sell no cars in a week. Three times they sold only 1 car, five times they sold 2 cars, eight times they sold 3 cars, they never sold 4 cars, eleven times they sold 5 cars, twenty times they sold 6 cars, they never sold 7 cars, three times they sold 8 cars and one time they sold 9 cars.

Find the probability that at least 5 cars were sold in a week.

Select one:

a. 17/26

b. 17/52

c. 35/52

d. 32/52

4. A study of the weekly car sales from last year resulted in the following information. Only once did the dealership sell no cars in a week. Three times they sold only 1 car, five times they sold 2 cars, eight times they sold 3 cars, they never sold 4 cars, eleven times they sold 5 cars, twenty times they sold 6 cars, they never sold 7 cars, three times they sold 8 cars and one time they sold 9 cars.

Find the probability that between 3 and 6, inclusive, cars were sold in a week.

Select one:

a. 11/52

b. 0.25

c. 0.75

d. 31/52

5. A study of the weekly car sales from last year resulted in the following information. Only once did the dealership sell no cars in a week. Three times they sold only 1 car, five times they sold 2 cars, eight times they sold 3 cars, they never sold 4 cars, eleven times they sold 5 cars, twenty times they sold 6 cars, they never sold 7 cars, three times they sold 8 cars and one time they sold 9 cars.

Find the probability that an odd number of cars were sold in a week.

Select one:

a. 23/52

b. 22/52

c. 20/52

d. 1

6. A mail-order company has 6 phones lines available. Let X denote the number of lines in use at a specified time. The probability density function is:

Calculate the probability- at most 3 lines in use.

Select one:

a. 0.25

b. 0.45

c. 0.55

d. 0.70

7. A mail-order company has 6 phones lines available. Let X denote the number of lines in use at a specified time. The probability density function is:

Calculate the probability- Fewer than 3 lines in use

Select one:

a. 0.25

b. 0.45

c. 0.55

d. 0.70

8. A mail-order company has 6 phones lines available. Let X denote the number of lines in use at a specified time. The probability density function is:

Calculate the probability- At least three lines in use

Select one:

a. 0.25

b. 0.45

c. 0.55

d. 0.70

9 A mail-order company has 6 phones lines available. Let X denote the number of lines in use at a specified time. The probability density function is:

Calculate the probability- Between 2 and 5 lines inclusive in use

Select one:

a. 0.45

b. 0.51

c. 0.65

d. 0.71

10. A mail-order company has 6 phones lines available. Let X denote the number of lines in use at a specified time. The probability density function is:

Calculate the probability- Either 1 or 2 phone lines in use

Select one:

a. 0.35

b. 0.45

c. 0.55

d. 0.65

Weekly Car Sales
X	Frequency	P(x)
0	1
1	3
2	5
3	8
4	0
5	11
6	20
7	0
8	3
9	1
Totals	52	=1

Solution