Answer:
do multiple choice
Step-by-step explanation:
Answer: $105.84
Step-by-step explanation:
20/100 = x/87.37
*cross multiply*
20*87.37 = 100x
1747.4 = 100x
*divide*
1747.4/100 = x
17.474
*add*
87.37 + 17.474
105.844
*round*
Answer:
First divide/multiply; then add/subtract
15÷5-1×2+8
= 3-1*2+8
= 3-2+8
= 3+6
= 9
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 