Please help
please.

The y axis isn't labeled; we'll figure it out.  Let's count square heights,

6-7) 3

7-8) 3

8-)   3

9) 3

10) 8

11) 8

12) 11

13) 11

14) 23

15) 19

16) 2

17) 2

18) 2

19) 2

Total  3+3+ 3+3+8+8+11+11+23+19+2+2+ 2+2 = 100

So each square height is ten mice.

We want the number less than 10 grams, that's the first four values.

10(3 + 3 + 3 + 3) = 10(12)=120

120