Lake Chevrolet
Help with Stats … average and the probability of finding …?
1.A study of the amount of time it takes for a mechanic to rebuild the transmission of a 1992 Chevrolet Cavalier shows that the average is 8.2 hours and the standard deviation is 1.4 hours. If 49 mechanics are randomly selected find the probability that their mean rebuild time is 8.5 hours. 2. The weight of fish in a lake some normally distributed with an average of 15 pounds and a standard deviation of 7 pounds. If 64 fish are selected at random, what is the probability that the average weight is less than 16.4 pounds?
1. z = (8.5-8.2) / [1.4 / 7) = 1.5 Prob (T> 8.5) = 0.0668 2. z = (16.4-15) / [7 / 8] = 1.6 Prob (p <16.4) = 0.9452 since the samples are n> 30 and / or SD are given, no need to launch what a t-distribution. Calculate z = (x-mean (x)) / (S / sqrt (n)) and pay attention to the question to see which side of the norm you calculate the area (probability) of. It allows a picture normal (bell) curve.
2010 Chevrolet Camaro
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