Aha can somebody help me! cant do this question

[gleaming kestrel]

First find the factor that the area is multiplied by to give the frequency

The total area * some constant, k, should give you 50

Using that find the frequency of each bar

And the mean will just be the the sum of the frequencies * their group’s midpoint

Divided by the total frequency

You can do standard deviation urself using the formula. The root of (the mean of the squares minus the square of the mean). I put that in brackets to show that you root the whole thing

I think you can do the last bit urself

Hope that helps!