What are real numbers? how are real used to solve problems

1 answer:

3 0

Real numbers are all numbers that you can get as a solution to a question.
Basically all numbers are real numbers if you can do whatever you want with it and get it as the answer.
I know this sounds like all numbers but there are number which dot not have solutions like square root of a minus number.For example of you type in root of -25 it will give you error

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Jamal used his abingdon you buy 15 pounds of flour at 0.42 per pound, 8 pounds of utter the 3.99 per pound, 1 pound of salt at 0

madreJ [45]

15 x .42= $ 6.30 Flour
8 x 3.99 = $31.92 Utter
1 x .67 = .67 Salt
30 x 1.49 = $ 44.70 Apples

Total = $83.59
Dollar amount is $83
Change amount is .59
If Jamal had $84.00 to spend his change was .41

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Taya2010 [7]

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Suppose the life of a particular brand of laptop battery is normally distributed with a mean of 8 hours and a standard deviation

Ierofanga [76]

Answer:

4.75% probability that the battery will last more than 9 hours before running out of power

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:

$\mu = 8, \sigma = 0.6$