Data Analysis Statistics Mock Tests

What is the mode of the data set: 3, 5, 7, 5, 9, 5, 11?

If the mean of 5, 8, 12, x, and 20 is 12, what is the value of x?

A data set has a mean of 20 and a standard deviation of 4. If each value in the data set is multiplied by 3, what is the standard deviation of the new data set?

What is the range of the data set: 15, 22, 8, 30, 12, 25, 5?

The average (arithmetic mean) of 10, 15, 20, x, and 30 is 20. What is the value of x?

A data set has mean 20 and standard deviation 4. If each value is multiplied by 3, what is the new standard deviation?

The mean of 5 numbers is 20. If one number is removed, the mean becomes 18. What is the value of the removed number?

The mean of a data set is 50 and the standard deviation is 10. If every value in the data set is multiplied by 3 and then 5 is added to each result, what is the standard deviation of the new data set?