What time seperates shortest of race times from longest
The race times for a mile long race of boys in secondary school is known to be distributed normally with mean 460 seconds and standard deviation 60 seconds.
what time seperates the shortest 90% of race times from the longest 10%?
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The race times for a mile long race of boys in secondary school is known to be distributed normally with mean. what time seperates the shortest 90% of race times from the longest 10%?
The library wants to take a sample to statistically estimate this mean. How large will the sample need to be to estimate the mean within 0.31 of 1 standard deviation with 0.95 confidence?
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