Question

ANSWER QUICK!!

Use the frequency polygon to work out an estimate for the mean rounded to 1 DP.

Answer 1

71

Explanation:

there are 5 data points

3*40 =120

5*52.5 = 262.5

8*65 =520

3*77.5=232.5

11*90=990

total frequency = 3+5+8+3+11 =30

total sum = 2125

so mean = 2125/30 =70.83 round to 71