Calculate the sample mean and the sample standard deviation to the nearest hundreths.

If this​ 3-year-old boy grows up to be a man with a height at the same​ percentile, what will his height​ be? Use a population mean of 70 inches and a population standard deviation of 3 inches

In a standardized exam the mean score is 400 with a standard deviation of 50. If a random sample of 25 students is selected , what is the standard deviation of the sampling distribution of the sample mean ?

The speed of cars driving past Johnson City High School, on 666 Reynolds Rd, were recorded over one school year. The speed limit on that part of Reynolds Rd is 20 mph. The mean of the speed readings was 24.19 mph, with a standard deviation of 3.56 mph.

Steel rods are manufactured with a mean length of 28 centimeters. because because of variability in the manufacturing process, the lengths of the rods are approximately normally distrubuted with a standard deviation of 0.06. Any rods that are shorter than 27.85 cm or longer than 28.15 cm are discarded. What proportion of rods will be discarded?   Round to 4 decimal places.

A primary measure of dispersion for sample data is the sample standard deviation, s.  Choose the best option to explain what the meaning of the sample standard deviation is, in general.   A. The distance between one observation and the mean. B. The average distance of an observation from the middle of the distribution. C. The average distance between observations in the sample. D. The distance between the third and first quartiles.

What is the standard deviation of the following sample data:  40, 49, 23, 47, 40, 17.   Round to 2 decimal places as needed.

Suppose that annual precipitation is normally distributed, with mean 50 inches, and standard deviation 12 inches. Find the 65th percentile of the precipitation distribution

Most medical schools require applicants for admission to take the Medical College Admissions Test (MCAT) examination. Scores on the MCAT are roughly normally distributed with a mean of 500 and a standard deviation of 10.6. What percentage of students score above 518 points? ( write as a decimal and round to the nearest hundredth)

A company conducted a survey to determine the average age of its employees. The ages of 10 randomly selected employees are as follows: 25, 28, 30, 35, 40, 42, 45, 48, 50, and 55. Calculate the sample mean, sample variance, and standard deviation of the ages.