Which of the following is not a measure of variability of a single variable?

a. range

b. covariance

c. standard deviation

d. coefficient of variation

A mean computed in such a way that each data value is given a weight reflecting its importance is referred to as

a. an important mean

b. a trimmed mean

c. a weighted means

d. a heavy mean

Just Need Three not all of them

Question 1: Please defined what are the measures of Central Tendency?

Question 2: Explain what are the differences among Mean, Median and Mode? Use a numerical example to support your answers.

Question 3: What is the Empirical Rule and when we use it?

Question 4: What is the Chebyshev's Theorem and when we use it? Also, explain the meaning of skewness in a distribution?

Question 5: How many quartiles we have in a Normal Distribution? How many deciles we have? How many percentiles we have? Briefly explain what is the Interquartile Range and support your answers with a numerical example!