Answer:
-9 = 0.45m
Step-by-step explanation:
0.45m -9 = 0.9m
-0.45m -0.45m
-9 = 0.45m
X = -1, x = 3
Sooooo, 2 x -1 = -1^2-3
which means, -2 = 1 - 3 which is -2 = -2
Then we also have 2 x 3 = 3^2 - 3
which means, 6 = 9 - 3 which is 6 = 6
So x = -1 and x = 3
Answer:
The degrees of freedom are:
The confidence level is 0.95 or 95%, the significance would be and , the critical value for this case would be
And replacing we got:
Step-by-step explanation:
Information given
In order to calculate the mean and the sample deviation we can use the following formulas:
(2)
(3)
represent the sample mean
population mean
s=9.956 represent the sample standard deviation
n=10 represent the sample size
Confidence interval
The confidence interval for the mean is given by the following formula:
(1)
The degrees of freedom are:
The confidence level is 0.95 or 95%, the significance would be and , the critical value for this case would be
And replacing we got:
Answer:
160
Step-by-step explanation:
With the problem, it's best to put this into a fraction
8/20 of every student will be absent from school less than five days a year, which can then be simplified to 2/5.
There are multiple ways to go about this problem, but my preferred way is to then take 1/5th of 400, which can be done by taking 1*400/5 which equals 80. Since we are asking for 2/5's, just multiply that number by 2, which gives us 160 students.