A postman records the weight of each parcel that he delivers. The histogram shows information about the weights of all the parcels that the postman delivered last Monday. No parcels weighed more than $$\(6 \mathrm{~kg}\)$$. 63 of the parcels that the postman delivered last Monday each had a weight between $$\(0.5 \mathrm{~kg}\)$$ and $$\(2 \mathrm{~kg}\)$$. (a) Work out the total number of parcels the postman delivered last Monday. (3) The postman picks at random two of the records of the parcels he delivered last Monday. (b) Work out an estimate for the probability that each parcel weighed more than $$\(2.25 \mathrm{~kg}\)$$. (3)

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