A female executive selecting her wardrobe purchased three blazers, two blouses, and five skirts in coordinating colors. how many
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Answer:
The standard deviation of the voltage is
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
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. Subtracting 1 by the pvalue, we This p-value is the probability that the value of the measure is greater than X.
The problem states that
Assume that the voltage is normally distributed with a mean of 0, so
A signal in a communication channel is detected when the voltage is higher than 1.5 volts in absolute value. What is the standard deviation of voltage such that the probability of a false signal is 0.05?
We know that . This means that when
the zscore has a pvalue of 0.95. Looking at the zscore table, we have that
. So
The standard deviation of the voltage is