What is the variance of a random sample of size 5 that is taken with replacement from a population with mean = 15 and  variance = 10?

A population consist of multiple of five numbers where is 5, 10, 15, 20, 25, and 30 with sample size of 2. Find the population variance.

Calculate the variance for the data set: 12, 15, 18, 20, 22

The mean and sample standard deviation of the dataset consisting of 10 observations is 16 and 10 respectively. Later it is noted that one observation 16 is wrongly noted as 10. What is the sample variance of the original dataset? (Correct to 2 decimal place accuracy)

A researcher conducts a repeated measures t-test with 10 subjects. If the estimated population variance of the difference scores is 20, what would the variance of the distribution of the means of difference scores be?

The numbers 5, 10, 15, and 20 are written on slips of paper, which are then placed in a hat. Two slips are randomly selected with replacement. Find the mean of the samples.Round off your answer to the nearest tenth.