Question: The temperature of a solution will be estimated by taking n independent readings and averaging them. Each reading is unbiased, with a standard deviation of

The temperature of a solution will be estimated by taking n independent readings and averaging them.

Each reading is unbiased, with a standard deviation of ???? = 0.5◦C. How many readings must be taken so that the probability is 0.90 that the average is within

±0.1◦C of the actual temperature?

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