Answer:
Mean = 60
Standard Deviation = 6
Step-by-step explanation:
Number of bags = 25
Mean = x`= 30
Mean= Total number of sweets/ Total number of bags
30 = Total number of sweets/ 25
Total number of sweets= 30*25= 750
When the sweets are doubled then the number of sweets is 750 *2= 1500
Mean= Total number of sweets/ Total number of bags
Mean = 1500/ 25
Mean = 60 (twice the mean of 750 sweets = 30)
As x`= ∑x/n
But the new mean is calculated as
2x`= ∑( x.2)/n= 2. (30)= 60
The co efficient of Standard deviation is calculated as
Co efficient of SD = Standard Deviation/ Mean
= 3/30 = 0.1
Multiplying with the new mean would give
Co efficient of SD * Mean= Standard Deviation
60 *0.1 = 6
It is the property of the variance that when each observation is multiplied by the square of a constant <u>²</u> the variance also increase by <u>a² </u>and so does the standard deviation.
To find the slope you have to use this formula:
First chose any 2 random points from the graph, im gonna chose (0,1) and (-4,4). It doesn't matter which one is the x1 or x2, what matter is they have to be in the same order, you can't have (-4,4) as a (x1,y2), That's wrong.
= -3/4
Answer: 45.4% of students like both building snowmen and skiing
18.1% of students who do not like building snowmen also do not like skiing
Step-by-step explanation:
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likes snowmen doesn't like snowmen total
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likes skiing 50 30 80
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doesn't like skiing 10 20 30
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total 60 50 110
X/-10 = 7
Step 1: Multiply by -10
(x/-10)*-10 = 7*-10
x = -70
Answer: a way for people to get answers to questions they don’t know
