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tyrique86
06.10.2019 •
Mathematics
Which graph best represents f(x)=|x|
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Ответ:
Ответ:
The standard deviation is 0.5338V.
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:
What is the standard deviation of voltage such that the probability of a false signal is 0.005.
This means that when X = 1.5, Z has a pvalue of 1-(0.005/2) = 0.9975. So when X = 1.5, Z = 2.81. Also when X = -1.5, Z has a pvalue of 0.0025. So Z = -2.81. Applying any of then, we find the standard deviation.
The standard deviation is 0.5338V.