StatisticsdrillNormal: above a value
A statistics problem from Statisticsdrill. Solve it with one answer box, with a fresh sample on every attempt and the worked steps and spreadsheet function in the answer, and it is checked the moment you submit.
The task
The number of kilowatt-hours a household uses per week is approximately normal with mean 60 and standard deviation 6. What is the probability that a randomly chosen household is above 75? Round to 4 decimal places.
What this problem teaches
Find z = (x - μ) / σ. Tables and NORM.DIST give the area below; the area above is 1 minus that.
A hint if you get stuck
Find z = (x - μ) / σ. Tables and NORM.DIST give the area below; the area above is 1 minus that.
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