MTH237 Unit 3 Review

What is the probability to the left of z=1.01

Enter your answer as a percent

(a)  

What is the probability to the right of z=2.87

Enter your answer as a percent

(a)  

What is the probability to the between z=-1.40 and z=2.11

Enter your answer as a percent

(a)  

What is the approximate z score when P(x)=10%

(a)  

Given that the mean of a data set is 11.5 and the standard deviation is 4.8; Find the probability of x being greater than 19.

Express your final answer as a percent.

(a)  

Given that the mean of a data set is 86 and the standard deviation is 18.5, find the probability of x being between 70 and 80

Express your final answer as a percent

(a)  

It is said that the average number of licks to the center of a tootsie pop is 107 with a standard deviation of 21 licks.

In a box of 80 tootsie pops, how many would you expect you can get to the center of in less than 100 licks?

(a)  

For a random data set, you are told that the mean is 45 and the standard deviation is 16, what is the approximate value for x if P(x)=99.76%

(a)  

The average lifespan of an Oral-B toothbrush is 14 months with a standard deviation of 7 months. If a random sample of 28 Oral-B tooth brushes are tested and this sample follows a normal distribution, find the probability that the sample mean months a toothbrush will last is more than 10 months.

express your answer as a percent

(a)  

The average weight of the boys wrestling team at SJB high school is 188 lbs with a standard deviation of 9 lbs. If 34 students on this team are tested, what is the probability that the sample mean weight will be less than 193 lbs.

express your answer as a percent.

(a)