Let 
be the 20 marks of the boys, and 
be the 10 marks of the girls.
We know that the global mean was 70, meaning that
Multiplying both sides by 30 we deduce that the sum of the scores of the whole classroom is
By the same logic, we work with the marks of the boys alone: we know the average:
And we deduce the sum of the marks for the boys:
Which implies that the sum of the marks of the girls is 
And finally, the mean for the girls alone is
The answer is B . because when u add them u will get 14400000 which is 1.44*10^7sq kilometers. did this help you?
Hi There!
Answer: Bowler 2
Why: if you notice that line in the box plot shows the median and it specifically shows that the meadian is 20 or so greater than Bowler 1.
We know that the formula for the volume of a box is:
Where:
l = length
w = width
h = height
The formula of the surface area of a box is:
Based on the given we know the following:
and
If we factor out the given volume, you can come up with 3 numbers that will satisfy the surface area formula:
Let:
l = 6cm
w = 7cm
h = 13cm
Now let's try this on the surface area formula:
The answer is then:
l = 6cmw = 7cmh = 13cmAny order would be fine.
Answer:
y=(5/2)x+14
Use the slope formula and slope-intercept form y=mx+b to find the equation
