The weights in grams of a number of stones, measured correct to the nearest gram, are represented in the following table.
A histogram is drawn with a scale of 1 cm to 1 unit on the vertical axis, which represents frequency density. The 1 − 10 rectangle has height 3 cm.
a) Calculate the value of x and the height of the 51 − 70 rectangle.
b) Calculate an estimate of the mean weight of the stones.

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