Which ratio is equivalent to the ratio 39 and 42

Mathematics

1 answer:

Marizza181 [45]3 years ago

6 0

78 and 84 this is because 78 and 84 simplifies to 39 and 42

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The toasters produced by a company have a normally distributed life span with a mean of 5.8 years and a standard deviation of 0.

andreev551 [17]

Answer:

d. 4.6 years

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:

$\mu = 5.8, \sigma = 0.9$