The table shows the weights of 100 children in class 1.

An estimate of the mean weight of the children is calculated as 44 kg.

Calculate the values ofaandb.

60 <w(kg) Frequency

20 <w<30 12

30 <w< 40 21

40 <w< 50 38

50 <w< 60aw< 70b

Answera= ........................... ,b= ...........................

ps last < should be greater OR equal to

How do I go about starting the problem?

Regards