ultimatesaiyan
07.03.2020 •
Mathematics
The diameters of ball bearings are distributed normally. The mean diameter is 123 millimeters and the standard deviation is 4 millimeters. Find the probability that the diameter of a selected bearing is greater than 129 millimeters. Round your answer to four decimal places.
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Ответ:
0.0668
Step-by-step explanation:
Problems of normally distributed samples can be solved using the z-score formula.
In a set with mean and standard deviation , the zscore of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.
In this problem, we have that:
Find the probability that the diameter of a selected bearing is greater than 129 millimeters.
This is 1 subtracted by the pvalue of Z when X = 129. So
has a pvalue of 0.9332
1 - 0.9332 = 0.0668
0.0668 = 6.68% probability that the diameter of a selected bearing is greater than 129 millimeters.
Ответ:
Firstly, take away x from both sides to get x + 10 = 86
Now take away 10 from both sides and we get x = 76
Hope this helps and a Brainliest would be very appreciated