The z-statistic for Brett's data is found to be as given by: Option A: -5.30 (approx).
<h3>How to find the value of z-statistic for population mean?</h3>
Suppose we're specified that:
- The sample mean =
- The population mean =
- The population standard deviation =
- The sample size = n
Then the z-statistic for this data is found as:
For this case, we've got:
- The sample mean = = 295
- The population mean = = 310
- The population standard deviation = = 20
- The sample size = n = 50
Thus, we get:
Thus, the z-statistic for Brett's data is found to be as given by: Option A: -5.30 (approx).
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brainly.com/question/1640298
This is a multi step problem. For this we do system of equations.
2.5x + 7y = 82.50
X+y = 24
To do the elimination method we have to make the y values equals to each other so we multiply the x+y=24 equation by 7
7x +7y = 168
-
2.5x + 7y = 82.50
———————————-
4.5x = 85.50
————————-
4.5. 4.5
X = 19
19 cats on Friday
To find the point that divides the segment into a 2:3 partition, a formula can be used. The formula is:
[ x1 + (ratio)*(x2 - x1) , y1 + (ratio)*(y2 - y1) ]
Substituting the given values:
[ -3 + (2/5)*(3 + 3) , 1 + (2/5)*(5 - 1) <span>]
</span>(-0.6 , 2.6)
Therefore, the point P that divides segment AB into a 2:3 ratio is found at (-0.6 , 2.6).
Let
x-------> the amount of 
solution
y--------> the amount of 
solution
we know that
so
-------> equation A
-------> equation B
substitute equation A in equation B
find the value of y
therefore
The student need 
of solution and 
of solution
<u>the answer is</u>
A) The percent values were written incorrectly in the equation
B) The amount of 7% solution should be written as 1 – x, not x – 1.
