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2 answers:
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Answer:
Assuming normal distribution, the mean number of calls for a n-hour day is of , in which
is the mean number of calls per hour, and the standard deviation is
, in which
is the standard deviation of the number of calls per hour.
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation
, the z-score 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 p-value, we get the probability that the value of the measure is greater than X.
N-instances of a normal variable:
For n-instances of normal variable, the mean of the distribution is: , and the standard deviation is
What is the mean and standard deviation of the number of calls it receives for n-hour day?
Assuming normal distribution, the mean number of calls for a n-hour day is of , in which
is the mean number of calls per hour, and the standard deviation is
, in which
is the standard deviation of the number of calls per hour.
You can use
Since it is an irregular triangle.
C refers to the angle and a & b refer to the adjacent sides.
So,
Since it is an irregular triangle.
C refers to the angle and a & b refer to the adjacent sides.
So,