If you have 2 grids with 100 squares in each and each grid = 1 whole how do you shade in 1.47

1 answer:

8 0

One grid will be completely shaded, to represent the 1 .

The other grid will have exactly 47 of the 100 little squares shaded. That's exactly .47 of the whole grid.

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A particular battery claims to have a mean life of 400 hours with a standard deviation of 30 hours. Approximately what percent o

Svetach [21]

Using the normal distribution, it is found that 25.14% of the batteries will last more than 420 hours.

<h3>Normal Probability Distribution</h3>

The z-score of a measure X of a normally distributed variable with mean $\mu$ and standard deviation $\sigma$ is given by:

$Z = \frac{X - \mu}{\sigma}$

The z-score measures how many standard deviations the measure is above or below the mean.

Looking at the z-score table, the p-value associated with this z-score is found, which is the percentile of X.

In this problem, we have that the mean and the standard deviation are given, respectively, by:

$\mu = 400, \sigma = 30$ .

The proportion of the batteries will last more than 420 hours is <u>one subtracted by the p-value of Z when X = 420</u>, hence:

$Z = \frac{X - \mu}{\sigma}$

$Z = \frac{420 - 400}{30}$

Z = 0.67

Z = 0.67 has a p-value of 0.7486.

1 - 0.7486 = 0.2514.

0.2514 = 25.14% of the batteries will last more than 420 hours.

More can be learned about the normal distribution at brainly.com/question/24663213

#SPJ1

3 0

1 year ago

A 20-oz iced tea at a certain restaurant has 90 calories. How many calories are there in a 36-oz iced tea?

kvv77 [185]

Answer:

the answer is 230 calories :)

Step-by-step explanation:

divide 160 by 16 to find out how much 1-oz is then times it by 23 to get the amount of calories in 23-oz. There you go I hope it helps :)

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3 years ago

A manufacturer makes ball bearings out of molten steel. It takes 5.24 cubic centimeters of molten steel to make ball bearings th

dlinn [17]

10 ball bearings is the correct answer, i hope it works

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2 years ago

Reading proficiency: An educator wants to construct a 99.5% confidence interval for the proportion of elementary school children

Shkiper50 [21]

Answer:

A sample size of 345 is needed so that the confidence interval will have a margin of error of 0.07

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of $\pi$ , and a confidence level of $1-\alpha$ , we have the following confidence interval of proportions.