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saveliy_v [14]
3 years ago
9

In Mrs. Robinson's class, there are 16 girls and 14 boys. The mean of the girls' heights is 63.7 inches, and the mean of the boy

s' heights is 65.4 inches. What is the mean of the heights of all 30 students? Express your answer as a decimal to the near tenth.
Mathematics
1 answer:
Elodia [21]3 years ago
8 0

Answer: 64.6

Step-by-step explanation:

If you add up 63.7 and 65.4 and then divide by 2 you get 64.6.

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Common denominators are only needed in adding and subtracting fractions.

14/15 * 5/2 

Step 1. Multiply the numerators.
14 * 5 = 70
Step 2. Multiply the denominators
15 * 2 = 30
Step 3. Simplify the fraction.
70/30 = 2 10/30 = 2 1/3      

*the fraction 10/30 can still be simplified by dividing both numbers by 10. Hence, 1/3.

Steps in Dividing fractions.

24/60 ÷ 8/15

Step 1. Get the reciprocal of the 2nd fraction. Reciprocal means the reverse of the fraction. Simply swap the places of the numbers.

Reciprocal of 8/15 is 15/8.

Step 2. Multiply the 1st fraction to the reciprocal of the 2nd fraction. Follow steps in multiplying fractions.

24/60 * 15/8 = (24*15) / (60*8) = 360/480

Step 3. Simplify the fraction.
360/480 = 9 / 12 = 3/4

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4 0
3 years ago
I really need help with this no sum answers or else. You will get 20 points and brain list
nordsb [41]

Answer:

if their asking for % then this is the answers

1. 41% of 900 is 369

2. 24%

3. 46%

4. 23%

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6. 23%

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5 0
3 years ago
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What is 58,000,000 in scientific notation
AleksAgata [21]
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3 years ago
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lesya692 [45]

Answer:

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Step-by-step explanation:

n=1, 4×1+5=9

n=2, 4×2 +5=13

::

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4 0
3 years ago
If CDEF is a kite, CD =15 find CG
SpyIntel [72]

Answer:

Step-by-step explanation:

CD = 15, so we have the hypotenuse.

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using our pyth. theorem, 15^2=9^2+CG^2

CG = 12

Hope this helped

5 0
2 years ago
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