Explaining mound-shaped distribution with mean

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Q1) Assume duration of human pregnancies follow mound-shaped distribution with mean of 266 days and the standard deviation of 16 days.

i) Approximately what percentage of human pregnancies last between 250 and 282 days?

ii) Between what two values will durations of 95% of all human pregnancy fall? Change these values to months (with decimals), suppose typical month has 30 day.

iii) Assume also that durations of horse pregnancies follow mound-shaped distribution with a mean of 336 days and standard deviation of 3 days. Is horse or a human more likely to have pregnancy that lasts within +- 6 days of its mean? Describe briefly."

Reference no: EM1318416

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