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2 years ago

Solve equations 5-5x=14-8x 3(2y-5)=4y-7

Mathematics

1 answer:

GaryK [48]2 years ago

5 0

5-5x=14-8x
-5x=9-8x
3x=9
x=3

3(2y-5)=4y-7
6y-15=4y-7
2y-15=-7
2y=8
y=4

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Answer:

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Now consider a group consisting of 36 couples.

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$P(X=r)=\binom{n}{r} \times p^{r} \times (1-p)^{n-r} ;x=0,1,2,3,.....$

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Let X = Numbers of girls in groups of 36 births

So, X ~ Binom(n = 36, p = 0.5)

Now, mean for the numbers of girls in groups of 36 births is given by;

Mean, E(X) = $n \times p$ = $36 \times 0.5$ = 18

Also, standard deviation for the numbers of girls in groups of 36 births is given by;

Standard deviation, S.D.(X) = $\sqrt{n\times p\times (1-p)}$

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2 years ago