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What size sample would be required

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The shape of the distribution of the reading speed ofsecond grade students in a large city is unknown. However, records indicate that the mean reading speed is 92 words per minute (wpm) and the standard deviation is 10 wpm.

To compute probabilities regarding the sample mean using the normal model, what size sample would be required?

There is a 5% chance that the mean reading speed of a random sample of 21 second grade students will exceed what value? Round answer to 2 decimal places.

What is the probability that a random sample of 11 second grade students from the city results in a mean reading speed of more than 96 words per minute? Round answer to 3 decimal places.

Reference no: EM132854311

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