I believe its 45.
Its hard to explain but what I can say is if you subtract the percentage with the total of the skins you would subtract what you had from there and then you would have 45.
Let the number of men and women in the room be represented by an arbitrary constant, x and y respectively.
x + y = 96
y = 96 - x
When one man leaves, we get: x - 1
When one woman replaces the man, we get: y + 1
So, y + 1 = 3(x - 1)
Substituting y = 96 - x, we get:
96 - x + 1 = 3x - 3
97 + 3 = 4x
100 = 4x
x = 25
Thus, there were 25 men and 41 women in the room originally.
Answer:
The conclusion is that the average level of decibel at the library has changed since the installation of a new computer plug
Step-by-step explanation:
From the question we are told that
The population mean is
The sample size is
The sample mean is
The sample standard deviation is
The level of significance is
The Null Hypothesis is
The Alternative Hypothesis is
The test statistics is mathematically evaluated as
substituting values
The negative sign show that this is a left-tail test
Now the critical value of the level of significance obtained from the critical values table is
Now comparing the critical value of the and the test statistics we see that critical value is greater than the test statistic which implies that the null hypothesis is rejected.
The conclusion is that the average level of decibel at the library has changed since the installation of a new computer plug