91 ÷ 10 = 9.1. The mean number of potatoes in a bag is 9.1 Practise working out mean, mode and range from a frequency table with this quiz. You may need a pen and paper to help you with your answers.

Physicists have discovered a sophisticated, previously unknown set of 'modes' within the human ear that put important constraints on how the ear amplifies faint sounds, tolerates noisy blasts, and ...