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WARRIOR [948]
3 years ago
12

I need help :( can anyone tell me the answer with a explanation?

Mathematics
2 answers:
Bond [772]3 years ago
5 0

Let's say the test is 100 points.

The 70% mean means that the mean for the 30 students was 70 points.  That means 2100 points were scored between all 30 students. (70·30=2100)

 

20 boys had a mean of 62% or 62 points for our test.  That means the boys earned 62·20 points, or 1240 points.

 

That then means the girls earned 2100 - 1240 points, or 860 points.

Since there are 10 girls, 860/10 = 86 or 86% mean on the test.

 

Girls rock!

stealth61 [152]3 years ago
5 0
The Answer Is 86 Percent.
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A gardener makes a new circular flower bed. The bed is teen feet in diameter. Calculate the circumference and the area of the ci
KATRIN_1 [288]

Answer:

I. Circumference of circular flower bed = 31.42 ft.

II. Area of circular flower bed = 78.55 ft²

Step-by-step explanation:

Given the following data;

Diameter = 10 ft

Radius = diameter/2

Radius = 10/2

Radius, r = 5 ft

I. To find the circumference of the circular flower bed;

Circumference of circle = 2πr

Substituting into the formula, we have

Circumference of circular flower bed = 2*3.142*5

Circumference of circular flower bed = 31.42 ft

II. To find the area;

Area of circle = πr²

Substituting into the formula, we have;

Area of circular flower bed = 3.142*5²

Area of circular flower bed = 3.142*25

Area of circular flower bed = 78.55 ft²

8 0
3 years ago
Need help real fast.
Nutka1998 [239]

Answer:

k=-2

Step-by-step explanation:

-1*-2=2

-1*-2=20*-2=0

-1*-2=20*-2=02*-2=-4

-1*-2=20*-2=02*-2=-45*-2=10

4 0
3 years ago
Concentrate and water are mixed to make juice. Which is the stronger
vladimir1956 [14]

Answer:

As a fraction, A is 3/8 concentrate in final product and B is 4/11.

A is, in other words, 33/88, and B is 36/88 concentrate in the final mixture.

So Mixture B is stronger, slightly.

Note that in order to make the fractions the same denominator, we had to 'expand' each fraction with the denominator of the other fraction. After that, the numbers are really easy to compare.

7 0
3 years ago
....................
VLD [36.1K]

Answer:

.........................

Step-by-step explanation:

5 0
3 years ago
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S (0) = (15*0)/(0 + 5) = 0/5 = 0
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