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larisa86 [58]
3 years ago
6

In Mrs.Ramons class, the ratio of boys and girls is 2 to 3. The class has 30 students. How many girls are in Mrs.Ramons class?

Mathematics
1 answer:
Kay [80]3 years ago
4 0

Answer:

18 girls

Step-by-step explanation:

2 / [2+3] x 30 =

2/5 x 30 =60/5 =12 are girls.

30 - 12 =18 are boys, so that:

18:12 =3:2

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-4x=4

Step-by-step explanation:

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simplify 5ab+9a-ab-7a and justify each step as associative , distributive, commutative, or additive property.
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Calculating the degrees of freedom, the sample variance, and the estimated standard error for evaluations using the t statistic
Yuliya22 [10]

Answer:

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Step-by-step explanation:

Part a

For the first part we have a sample of n =10 and we want to find the degrees of freedom, and we can use the following formula:

df = n-1= 10-1=9

d.9

Part b

From a sample we know that n=41 and SS= 600, where SS represent the sum of quares given by:

SS = \sum_{i=1}^n (X_i -\bar X)^2

And the sample variance for this case can be calculated from this formula:

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Part c

For this case we have the sample size n = 25 and the sample variance is s^2 =400 , the standard error can founded with this formula:

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Answer:

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I proceeded to divide the shape up into 2 triangle and 1 square. The added sum of the 2 divided triangles is 16 and the square is 16. Add those to to get <u>32</u>.

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A=

A=

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Also, is that Khan Academy?

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