Question

In a certain advisory there are nine fifteen year olds, seven sixteen year olds and two seventeen year olds. How old is the average advisory member (rounded to the nearest tenth)?

Answer 1

15.6

Answer 2

Can you plot a table with the age, frequency and \(\rm age \times frequency\)?

Answer 3

((9*15)+(7*16)+(2*17))/(9+7+2) = average age
(135+112+34)/(18) = average age
281/81 = 15.6 years old

Answer 4

Round to the nearest tenth.