Write or draw to explain two different ways to find the difference for 12-3

Mathematics

2 answers:

ValentinkaMS [17]3 years ago

8 0

12-3=9
12+(x)=-3
-3+(x)= -12

vladimir2022 [97]3 years ago

7 0

12-3 is 9. Another way to find the difference is by drawing out 12 shapes and canceling out 3. When you count up the remaining shapes you get 9. Another way is simply by subtracting 3 from 12 to get 9.

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Answer:

Due to the higher z-score, he did better on the SAT.

Step-by-step explanation:

When the distribution is normal, we use 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.

Determine which test the student did better on.

He did better on whichever test he had the higher z-score.

SAT:

Scored 1070, so $X = 1070$