Write an addition that helps you solve 12-4

1 answer:

3 0

8+4 = 12. Therefore, 12 - 4 must equal 8 ,right?
And if 4+4+4 (4x3) =12, and you take away 1 group of 4, you will have
two groups of four right? and two groups of four (4x2) must equal 8 ,right?

From One Smartie to Another- BubbleSmartie11

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The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a me

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Step-by-step explanation:

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the zscore of a measure X is given by:

$Z = \frac{X - \mu}{\sigma}$

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

In this problem, we have that:

$\mu = 235, \sigma = 20$