Please help:)I’m not good at math and need to get this done ASAP

Mathematics

1 answer:

german2 years ago

8 0

Answer:

25 

Step-by-step explanation:

let's solve,

=》

$5 {}^{ \frac{ - 5}{2} } \times 5 { \frac{9}{2} }^{}$

=》

${5}^{ \frac{ - 5}{2} + \frac{9}{2} }$

=》

$5 {}^{ \frac{4}{2} }$

=》

$5 {}^{2}$

=》

$25$

glad to help you.....

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9. Gold miners in Alaska have found, on average, 12 ounces of gold per 1000 tons of dirt excavated with a standard deviation of

netineya [11]

Answer:

9.18% probability the miners find more than 16 ounces of gold in the next 1000 tons of dirt excavated

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:

$\mu = 12, \sigma = 3$