Evaluate -2/5-4/5+(-9/10)
1 answer:
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Answer:
14.69% probability that defect length is at most 20 mm
Step-by-step explanation:
When the distribution is normal, we use 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 question, we have that:
What is the probability that defect length is at most 20 mm
This is the pvalue of Z when X = 20. So
has a pvalue of 0.1469
14.69% probability that defect length is at most 20 mm
For this case we have that by definition, the area of a rectangle is given by:
Where:
b: It is the base of the rectangle
h: It is the height of the rectangle
By definition we have to:
1 meter equals 0.1 decameters
1 centimeter equals 0.001 decameters
According to the data of the statement we have:
Thus, the area of the rectangle is:
Answer: