Using addition of variables, it is found that the mean of S is of 73 and the standard deviation is of 8.5.
<h3>What happens to the mean and the standard deviation when two variables are added?</h3>
- The mean is the sum of the means.
- The standard deviation is the square root of the sum of variances.
In this problem, for variables A and B, we have that:
Variable S is the sum of A and B, hence:
The mean of S is of 73 and the standard deviation is of 8.5.
More can be learned about addition of variables at brainly.com/question/26156502
Answer:
6
Step-by-step explanation:
take 32 and subtract 8 which then u get 24 and divide that by 4 which is 6
If you divide 220 by 28 then times the answer by 1.25 the answer is 9.82 dollars.
You can just manually add 6 until you come across 324. So the answer is 12 terms.
You can also use this formula:
Sum = n/2 * (2a + (n-1)d)
and solve for n.
(n = number of terms, a = starting term, d = common difference)
Answer:
0.6t - 4.3s -2.6
Step-by-step explanation:
Given the expression
(-3.5t - 4s + 4.5) + (-7.1 - 0.3s + 4.1t)
Collect the like terms
= -3.5t+4.1t-4s-0.3s+4.5-7.1
= 0.6t - 4.3s -2.6
Hence the required expression is 0.6t - 4.3s -2.6
