Question

Can check the answers for me?

Answer 1

x 1 2 3 4 5 6
Prob 1/6 1/6 1/6 1/6 1/6 1/6
1. P(X is less than or equal to 2)= 1/3
2. The mean of X= 3.5
3.Probability of rolling a value greater than 3= 1/2
4. Which is an example of a discrete random variable?
-Lenght of a car
-amount of water in a swimming pool
-Weight of a person selected at random
-Number of apples purchased by a random customer at a grocery store√

5. Which of the following is an example of a continuous random variable?
-Height of a tree√
-Number of cards randomly drawn by a person from a deck
-Number of people taking math classes at a college
-Amount of boats racing in a boating event.

6.A new Firestone tire is guaranteed to last for 40,000 miles. The actual mean life of the tires is 47,000 miles with a standard deviation of 4,000 miles.
-What is the probability that a tire will not last for 40,000 miles?
-The Ford Motor Company uses Firestone Tires and is concerned about the performance of the tires. They conduct a study and find that out of the 120 tires they tested, the mean life was only 46,500 miles. Should the Ford Motor Company be concerned about Firestone's honesty about its tires? Provide a statistical justification for your response. Need help on this one

7.A GE lightbulb is supposed to last for 1,200 hours. In fact, light bulbs of this type last only 1,185 hours with a standard deviation of 70 hours. What is the probability that a sample of 100 lightbulbs will have an average life of at least 1,200 hours?

Answer 2

1. \(\color{red}{\checkmark}\)

2. \(\color{red}{\checkmark}\)

Answer 3

3. \(\color{red}{\checkmark}\)

Answer 4

wats ur answer for 4th question ?

Answer 5

4.Number of apples purchased by a random customer at a grocery store
5.Height of a tree

Answer 6

Correct too !!

Answer 7

6 and 7 i don't understand how to do it

Answer 8

6.A new Firestone tire is guaranteed to last for 40,000 miles. The actual mean life of the tires is 47,000 miles with a standard deviation of 4,000 miles.
-What is the probability that a tire will not last for 40,000 miles?

Answer 9

mean = 47,000
standard deviation = 4,000

Answer 10

start by finding the zscore for observation : 40,000

Answer 11

(40000-47000)/4000=-1.75

Answer 12

1-0.0401=.9599

Answer 13

so 96%

Answer 14

@ganeshie8

Answer 15

b