What is 0.75% of 387

Mathematics

2 answers:

Alex787 [66]3 years ago

8 0

percent means out of 100. move the decimal 2 places to the right

.75% = .0075

.0075* 387 =2.9025

luda_lava [24]3 years ago

3 0

Answer: 2.9025

Step-by-step explanation:

0.75 x 387/100

= 2.9025

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Answer:

For the 99th percentile, we have X = 206 seconds.

Step-by-step explanation:

Problems of normally distributed samples 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.

In this problem, we have that:

$\mu = 138.5, \sigma = 29$