Question

Question 1: Solve all of the above

Note: Absloute answers with 4 digits ex: 1.1234

A) An engineer measure 4 different pressures, 91, 99, 91 and 95 psi. What is the standard deviation of these measurments?

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B) A UJ student drives every day from his home to his university. Time to reach university is distributed normally with a mean of 50 minutes and with standard deviation of 12 minutes. Find the probability that the time to reach university will take between 43.76 and 54.68 minutes?

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C) A health organization is responding to the high demand of masks as a result of COVID-19 outbreak by operating a workshop to produce simple surgery masks. The daily production average and standard deviation were respectively calculated as 8,730 and 755 masks based on the last 15-days records. What is the lower limit of a 90% two sided confidence interval constructed to estimate the mean value of the daily production capacity in that workshop?

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D) Find the probability for Z>1.75 given that Z is Standard Normal Distribution?

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Answer 1