The sum of thwo numbers is 25. their difference is 7. find the numbers

1 answer:

3 0

This problem would just be x + (x +7) = 25. It can be simplified to 2x = 18, which can be further simplified to x = 9. 9 is one of your answers. To find the other number, just add 7. Your numbers would be 9 and 16, which do add to 25.

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Step-by-step explanation:

Let X the random variable that represent the heights of a population, and for this case we know the distribution for X is given by:

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Where $\mu=30$ and $\sigma=7.8$

For this part we want to find a value a, such that we satisfy this condition:

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As we can see on the figure attached the z value that satisfy the condition with 0.20 of the area on the left and 0.80 of the area on the right it's z=-0.842

If we use condition (b) from previous we have this:

$P(X$