A question is asked of a class of 1,200 freshmen, and 24% of the students know the correct answer. If a sample of 50 students is taken repeatedly, what is the standard deviation of the sampling distribution of sample proportions? (Round your answer to four decimal places.)

The annual salary for one particular occupation is normally​ distributed, with a mean of about ​$132,000 and a standard deviation of about ​$16,000. Random samples of 26 are drawn from this​ population, and the mean of each sample is determined. Find the mean and standard deviation of the sampling distribution of these sample means.​ Then, sketch a graph of the sampling distribution.

About 10% of the population had a particular genetic mutation. 900 people are randomly selected. Find the standard deviation for the number of people with the genetic mutation in such groups of 900. Round answer to 4 decimal places.

Seven students on an intramural team weigh 205 lb, 193 lb, 200 lb, 211 lb, 183 lb, 202 lb and 206 lb. What is the standard deviation of the weights of these students? The standard deviation is (Round to the nearest tenth.)

A quiz consists of 40 multiple choice​ questions, each with five possible​ answers, only one of which is correct. If a student guesses on each​ question, what is the mean and standard deviation of the number of correct​ answers? Round to the nearest thousandth.

An instructor selected a sample of the following quiz scores(out of possible 10 points) for 12 students in one of his classes: 9 10 2 6 7 7 4 3 3 8 5 7  The standard deviation for this set of scores is what?

An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for each of the four crashes was $412, $451, $417, $232 O. Compute the range, sample variance, and sample standard deviation cost of repair. The range is $ s? = dollars? (Round to the nearest whole number as needed.) s=S S= $ (Round to two decimal places as needed.)