hhvgbv49551
29.01.2021 •
Mathematics
Pls help I am failing and pls don’t put a random answer or I will report you
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Ответ:
a. $302
Step-by-step explanation:
Problems of normally distributed samples are 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 question, we have that:
Point in the distribution below which 2.5% of the PCE's fell.
This is the 2.5th percentile, which is X when Z has a pvalue of 0.025. So it is X when Z = -1.96.