Can someone help me with this question?

I have to draw a histogram for the following

Repair cost($1000s)....................Frequency

less than 10.....................................3

atleast 10 but less than 20.................5

atleast 20 but less than 30.................7

atleast 30 but less than 40.................5

atleast 40 but less than 60.................3

atleast 60 but less than 100................2

and also estimate the mean and variance.

thanks you very much.