NEED HELP!!!

NEED HELP!!!

Students in a college course take a common final exam. The exam scores are normally distributed with a mean of 76 and a standard deviation of 8. Bob scored an 88.What percent of students scored...

I read that once a population reaches 25% of a certain trait or ideal (in human populations) that it will increase exponentially after that, is this true and is there a name for this increase?

A college offers two courses in Calculus - Calc 1 and calc 2. Last semester, 60.9% of students took calc 1 and the rest took calc 2 ( no student took both the courses). Of the students who took calc...

akili has two tests, the probabil that he will pass the first test is 3/4. How he does on the first test affects the second test. If he passes the first test there is a 4/5 chance that he will pass...

Is a part two to this question asking what is the probability of there being fewer than 2. So if you can help with that as well it would be greatly appreciated.

What is the probability of reaction time for less than 45 sec / reaction time between 30 and 45 sec./ Reaction time is more than 70 sec.

A simple random sample of women aged 18-24 is selected, and the systolic blood pressure of each woman is measured. The results (in mmHg) are as follows: = 120.7, s = 14.7. The sample size is less...

The question on the study guide is as follows: IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. Joe has an IQ that is higher than 99% of people. What...

A friend lends you $440, which you agree to repay with 5% interest. How much will you have to repay?

A friend lends you $440, which you agree to repay with 5% interest. How much will you have to repay?

A basketball team has won 70% of its games so far this season. What is the probability that it will win 8 of its next 10 games?

A nurse at a local hospital is interested in estimating the birth weight of infants. How large a sample must she select if she desires to be 99% confident that the true mean is within 2 ounces of...

A sample of size 50 is selected from a normal distribution having a mean of 95 and a standard deviation equal to 15. What is the probability of selecting a sample having a mean exceeding 100?

please provide the solution and the steps prior

The times per workout an athlete uses a stairclimber are normally distributed, with a mean of 20 minutes and a standard deviation of 5 minutes. An athlete is randomly selected. Find the probability...

Suppose ACT Reading scores are normally distributed with a mean of 21.4 and a standard deviation of 6.4. A university plans to award scholarships to students whose scores are in the top 7%. What is...

Historically, a manufacturer finds that 1% of integrated circuits of a certain type fail during burn-in testing. Burn-in testing results (pass/fail) on the latest shipment of 10,500 circuits are to...

These are the answer choices A. .028 B. .333 C. .25 D. .166

it is a probability question. I need help

Assume that the data has a normal distribution, n = 45 and that σ is known. Find the appropriate critical value used to test a null hypothesis about a mean with α = 0.05 for a right-tailed test....