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4 years ago

PLEASE HELP!!!

Mathematics

2 answers:

Anna007 [38]4 years ago

7 0

Answer:

Graph (C)

Step-by-step explanation:

Naoya read a book at a rate of 55 pages per hour.

After 4 hours he read the pages = 55×4 = 220

As it's given that after 4 hours number of pages left to read = 350

Total numbers of pages in the book = 220 + 350 = 570

If he read the book for x hours, number of pages read = 55x

And number of pages left to read (y) = 570 - 55x

y = -55x + 570

y-intercept,

y = 0 + 570

y = 570

x-intercept,

0 = -55x + 570

x = 10.36

Graph (C) represents positive x and y intercepts.

Therefore, Graph (C) will be the answer.

stealth61 [152]4 years ago

5 0

Answer:

Graph C

I did it on Khan Academy

Step-by-step explanation:

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The diameters of bolts produced in a machine shop are normally distributed with a mean of 5.7 millimeters and a standard deviati

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Answer:

The diameter that separates the top 3% is of 5.85 millimeters, and the one which separates the bottom 3% is of 5.55 millimeters.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean $\mu$ and standard deviation $\sigma$ , the z-score 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 p-value, we get the probability that the value of the measure is greater than X.

Mean of 5.7 millimeters and a standard deviation of 0.08 millimeters.

This means that $\mu = 5.7, \sigma = 0.08$