I need help with this math problem.

Mathematics

1 answer:

MakcuM [25]3 years ago

7 0

2.(x + 6).(3x - 2) = 0

In a multiplication if one of the terms is equal to 0, everything is equal to 0

So:

If x + 6 = 0, we have a root

x + 6 = 0

x = -6

If 3x - 2 =0, we have a root

3x - 2 = 0

3x = 2

x = 2/3

So our least root is -6 and the greatest is 2/3

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Answer:

Test scores of 10.2 or lower are significantly low.

Test scores of 31 or higher are significantly high

Step-by-step explanation:

Z-score:

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:

$\mu = 20.6, \sigma = 5.2$