New York City SHSAT 2017

AVERAGE, MEDIAN, AND MODE

Remember this formula: Average = Sum of the terms/Number of the terms.

The average (arithmetic mean) of 15, 18, 15, 32 and

When there is an odd number of terms, the median of a group of terms is the value of the middle term with the terms arranged in

increasing order.

When there is an even number of terms, the median is the average of the two middle terms with the terms arranged in increasing

order.

The mode is the value of the term that occurs most.

Note: Not all sets have a mode.

Exercise

First, put the terms in order from small to large: 15, 15, 18, 20, 32.

Then, identify the middle term. The middle term is 18.

In the above list, 15 occurs twice, so it is the mode.

There are five children whose ages are 11, 5, 8, 5, and 6.

What is the average age?

What is the median age?

Which age is the mode?

xi.