The mean weight of loads of rock is 47.0 tons with a standard deviation of 8.0 tons. If 25 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is less than 46.5 tons. Assume that the variable is normally distributed.
Added by Heather M.
Step 1
The standard error is the standard deviation divided by the square root of the sample size. In this case, the standard error is 8.0 tons / sqrt(25) = 1.6 tons. Show more…
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