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4 years ago

Can i please get help with this question?

Mathematics

1 answer:

Darya [45]4 years ago

6 0

$x + \frac{1}{3}=9$

We know that:

$\frac{a}{b}+\frac{c}{d}=\frac{a.d+b.c}{b.d}$

So,

$x + \frac{1}{3} = \frac{x.3+1.1}{1.3} = \frac{3x+1}{3}$

$\frac{3x+1}{3}=9$

Pass the 3 as multiplication

$3x + 1 = 3.9$

$3x + 1 = 27$

$3x = 27 - 1$

$3x = 26$

$x=\frac{26}{3}$

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3 years ago

Read 2 more answers

Dear Math Helper,

valentina_108 [34]

Answer:

n = 98, that is, she scored at the 98th percentile.

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.

In this question, we have that:

She scored 38, so $X = 38$