How does Snow White need to change her value for mean-dwarf-height after a mix-up?
From the mean weight of five ballet dancers and the mean weight of ten rugby, what is the average weight of all fifteen people?
From the mean of 64 numbers, and the mean of the first 36 of these numbers, can you work out the mean of the last 28 numbers?
Can Emily increase her average test score to more than $80$%? Find out how many more tests she must take to do so.
What is the largest number Sophie can use to have 7 positive integers with a mean of 7?
How many three digit numbers have the property that the middle digit is the mean of the other two digits?
The ladybird five-a-side squad has six members. The average number of spots is 12. How many spots does the pine ladybird have?