# A mistake on lecture 5

There is a mistake on lecture 5, calculation of groups frequencies.

The instructor said that a number is included in a particular interval if that number is greater than the lowest bound and equal to or less than the largest bound.

The frequency of the first interval is **2** (**1** and **9**),

The first interval goes from 1 to 21, so 1 should not be included. Or the rule should be adjusted as:

A number is included in a particular interval if that number is **equal or greater than the lowest bound and less than the largest bound.**

1 answers ( 0 marked as helpful)

I thought the same, but the **first number** -** in this case 1**- is always included in the first interval, and the

**last number**is always included in the last interval.