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Percentiles for the standard normal distribution

Find the following percentiles for the standard normal distribution. Interpolate where appropriate. (Round your answers to two decimal places.) (a) 71st

(b) 29th

(c) 75th

(d) 25th

(e) 10th

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## Q : Question regarding the population mean

How large a sample should be taken if the population mean is to be estimated with 90% confidence to within $79? The population has a standard deviation of $908.