CAPE Applied Mathematics Unit 1 · 2018 · Paper 1 · Question Q43
The weights of iron rods manufactured by a certain company are normally distributed with a standard deviation of 3.4 kg. A random sample of 35 iron rods with mean weight of 40.2 kg is selected. A 99% confidence interval for the population mean is
- (A)(38.7, 41.7) kg
- (B)(38.9, 41.5) kg
- (C)(41.5, 38.9) kg
- (D)(41.7, 38.7) kg
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