Step-by-step explanation:
Well in general, we can represent subtraction as:
"z" represents the difference, and it really just represents x with y taken away. So if we were to "give back" this y value, we should get "x".
This means that:
So one way to check, is adding the value that's being subtracted (y value) and the difference (z value), this should get you the value that is being subtracted from (x value). If you don't get the original value that's being subtracted from (x-value) then you know the answer you got is wrong.
Answer:
a) The third quartile Q₃ = 56.45
b) Variance
Step-by-step explanation:
Given that :
= 30.8
Median = 48.5
Mean = 42
a) The mean is less than median; thus the expression showing the coefficient of skewness is given by the formula :
Divide both sides by 1.38
b) The objective here is to determine the approximate value of the variance;
Using the relation
Variance =
Answer:
Step-by-step explanation:
Given
Required
The solution in radical form
Rewrite as:
Using the quadratic formula, we have:
Where
a = 1
b = -10
c = -6
So, we have:
Split the roots
Express as 2
Split the fraction