IB Statistics and Probability Problem 001

A data set contains \(n\) values.

The sum of the values is \(800\) and the mean is \(20\).

  1. Find \(n\).

The standard deviation of this data set is \(3\).

Each value in the data set is multiplied by \(10\).

    1. Write down the value of the new mean.
    2. Find the value of the new variance.
Published by Annie Bernatchez in «Statistics and Probability». Key Words: IB, question