Weights Weights

How do you work out the mean weight on a frequency table?

Marcus collected some pebbles.
He weighed each pebble.
The grouped frequency table gives some information about weights.

Weight (w grams) Frequency
50 < w < 60 5
60 < w < 70 9
70 < w < 80 22
80 < w < 90 27
90 < w < 100 17

Work out an estimate for the mean weight of the pebbles.

[55*5+65*9+75*22+85*27+95*17] / (5+9+22+27+17)

= (275+585+1650+2295+1615) / 80
= about 80 but use a calculator

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