| Exam Board | CAIE |
|---|---|
| Module | S2 (Statistics 2) |
| Year | 2015 |
| Session | November |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Measures of Location and Spread |
3 Jagdeesh measured the lengths, $x$ minutes, of 60 randomly chosen lectures. His results are summarised below.
$$n = 60 \quad \Sigma x = 3420 \quad \Sigma x ^ { 2 } = 195200$$
(i) Calculate unbiased estimates of the population mean and variance.\\
(ii) Calculate a $98 \%$ confidence interval for the population mean.
\hfill \mbox{\textit{CAIE S2 2015 Q3}}