Approximating probability using standard deviation of sample

Reference no: EM1321810

Q1) Sample of size 26 was taken from normal population with standard deviation 1.697. Approximate the probability that standard deviation of sample is greater than 1.23.

Q2) McDonald's manager knows that cars arrive at drive-through at rate of 2 cars per minute between hours of 12 noon and 1:00 p.m. Determine probability that fewer than 6 cars arrive between 12 noon and 12:05 p.m.?

Q3) There are 30 identical items in delivery box. For box to pass inspection, at least 20 of those items must be in good condition. If inexperienced quality inspector finds out randomly whether or not item is in good condition, determine the probability that box will pass inspection?

Reference no: EM1321810

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