The table gives information about the time spent, in minutes, by 50 people listening to the radio last Thursday.
| Time spent (x x\,x minutes) | Frequency |
|---|---|
| 0<x≤300 < x \leq 300<x≤30 | 12 |
| 30<x≤4030 < x \leq 4030<x≤40 | 25 |
| 40<x≤6040 < x \leq 6040<x≤60 | 8 |
| 60<x≤10060 < x \leq 10060<x≤100 | 5 |
Calculate an estimate for the mean time. You may use ∑fx=1855\sum fx = 1855∑fx=1855.
Calculate the estimate for the standard deviation of the distribution. Give your answer correct to 1 decimal place.
10 exam-style questions on Edexcel GCSE Statistics Standard Deviation. Each one has a worked solution and a mark scheme showing where the marks go.