A company of coffee prices at 4 randomly seleced grocery stores in Sampaloc, Manila showed increases from the previous month of 12, 15, 17, and 20 Pesos for 200 gram jar. Find the sample variance and sample standard deviation.

A developmental psychologist is interested in studying how long babies gaze at a photograph of a human face. To test this question, she shows a picture to a sample of six babies and records the length of their gaze in seconds. The data are as follows: 12, 17, 18, 20, 20, 29. Calculate the mean, median, mode, range, variance and standard deviation for the sample.

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.

find the sample variance and standard deviation 20, 10, 2, 06, 08