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sattari [20]
3 years ago
6

The ratio of boys to girls in a classroom is 2:6. If there are 40 students in the classroom, how many of them are girls.

Mathematics
2 answers:
Vera_Pavlovna [14]3 years ago
8 0

Answer:

120

Step-by-step explanation:

Boys will be the'2' of this ratio

e we know that 2x3 = 6

so, 40 x 3 will give us the number of girls

Nutka1998 [239]3 years ago
8 0

ratio can be simplified to 1:3

for every 1 boy there are 3 girls and together there are 4 total kids. So there would be 30 girls and 10 boys in the classroom.

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The following are the answer to this question:

Step-by-step explanation:

In the given question the numeric value is missing which is defined in the attached file please fine it.  

Calculating the probability of the distribution for x:

\to f(x) = 0.19\  for \ x=14\\\\\to  f(x) = 0.29 \ for\ x=7\\\\\to f(x) = 0.38\  for \ x=1\\\\\to f(x)=0.14 \ for \ x=0\\

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\bold{E(X^2) = x^2 \times f(x)}

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use formula for calculating the Variance:

\to \bold{\text{Variance}= E(X^2) -[E(X)]^2}

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calculating the value of standard deivation:

Standard Deivation (SD) = \sqrt{Variance}

                                          = \sqrt{26.13} \\\\=5.111

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