Answer:
-3 -17h + 28
Step-by-step explanation:
This app deleted my question so im going to ask again. please help!!! due at 5:00
2 answers:
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To form the first group, we can choose from a group of 17 people.
To form the next group, we need to consider how many people are left (17 - 6 = 11)
So, from a group of 11 people, we can have 3 people in it.
There is only one way to group the last 8 people. Thus, they are going to be 1 group.
BUT we would have overcounted because of the fact that they can be chosen in different ways. This is because they are not distinct groups or ordered groups. For example, the third group can be chosen first, the second can be chosen last, etc.
So, to counter this, we need to divide by 3!
There are 340, 340 ways.
To form the next group, we need to consider how many people are left (17 - 6 = 11)
So, from a group of 11 people, we can have 3 people in it.
There is only one way to group the last 8 people. Thus, they are going to be 1 group.
BUT we would have overcounted because of the fact that they can be chosen in different ways. This is because they are not distinct groups or ordered groups. For example, the third group can be chosen first, the second can be chosen last, etc.
So, to counter this, we need to divide by 3!
There are 340, 340 ways.
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