7 The table shows the weights of some chickens. Weight, w kg Frequency
1.5 ≤ w < 2 7
2 ≤ w < 2.5 12
2.5 ≤ w < 3 6
3 ≤ w < 3.5 14
a Work out an estimate for the mean weight. Give your answer to 2 s. f.

Awater truck is filling a swimming pool. the equation that represents this relationship is y=19.75x where y is the number of gallons of water in the pool and x is the number of minutes the truck has been filling the pool.