Age at last Birthday | f | Age to nearest Birthday | f | |

1-6yrs | 7 | 2-4 | 4 | |

7-12 | 6 | 5-7 | 2 | |

13-18 | 5 | 8-10 | 3 | |

19-24 | 4 |

**1.** Calculate the mean and median on both sets of data.

**2.** Calculate IQR and the standard deviation and interpret
your results.

**3.** If the 11:00 statistics class has a class average of
70, a standard deviation of 2 and

a normal distribution, answer the following questions:

If you score 74 in the 11:00 class, how many score higher than you?

There are 100 people in the 11:00 class. Your roommate scored 70 and you scored 72. How many people scored more than your roommate but less than you?

**4.** Interpret the standard deviation for these bank balances:

Group A has mean of $40 and s of $2 and normal distribution.

Group B has mean of $40 and s of $2 and smooth unimodal distribution.

Group C has mean of $40 and s of $2 and unknown distribution.

Group D has mean of $40 and s of $30 and normal distribution.

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