Express each ratio as a fraction in the simplest form. 12 beetles out of 18 insects .

Mathematics

1 answer:

slava [35]2 years ago

3 0

Answer:

2/3

Step-by-step explanation:

12/6=2

18/6=3

the fraction is 2/3

i think this is what your teachers means, lmk if thats wrong

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nlexa [21]

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A score of 150.25 is necessary to reach the 75th percentile.

Step-by-step explanation:

Problems of normal distributions can be 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.

A set of test scores is normally distributed with a mean of 130 and a standard deviation of 30.

This means that $\mu = 130, \sigma = 30$