15% of what percent is 147?

Mathematics

2 answers:

igomit [66]3 years ago

6 0

22.05

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Dima020 [189]3 years ago

5 0

Answer:

147 * 0.15 = 22.05

Step-by-step explanation:

To do other, divide the percentage by 10 then times that with the number you wish to change. Example:

30% of what percent is 130: 130 * 0.3 = 44.1

157% of what percent 956: 956 * 1.57 = 1500.92

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Among freshman at a certain university, scores on the Math SAT followed the normal curve, with an average of 550 and an SD of 10

lina2011 [118]

Answer:

a) 6.68th percentile

b) 617.5 points

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:

$\mu = 550, \sigma = 100$