Question

Kylie measured the length, x, of each the insects she found underneath a rock. She recorded the lengths in the table below.

Calculate an estimate of the mean length of the insects she found.
Give your answer in millimetres(mm)

Answer 1

To estimate the mean length of insects, add up their measured lengths and divide by the number of insects, using millimeters as the unit of measurement.

Step-by-step explanation:

The student is tasked with estimating the mean length of insects measured in millimeters. Since the insects are small, a ruler with millimeter markings is the suitable measuring tool. To find the mean length, one would add up all of the recorded lengths of the insects and then divide by the number of insects. This mean value represents the average size of the insects found under the rock. If the bug to be measured is extremely small, needing a magnifying glass to be seen, then millimeters would indeed be the appropriate unit for measurement due to their small scale.

Answer 2

16

Step-by-step explanation:

First, find the midpoint of the lengths you have. Then multiply by the frequency.

so:

5x5= 25

15x8= 120

25x7= 175

Then add all the numbers you got.

So:

25+120+175= 320

Add all the frequencies: 5+8+7= 20

Answer: 320/20= 16