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const2013 [10]
3 years ago
15

HELP PLEASE... 10 POINTS

Mathematics
1 answer:
jasenka [17]3 years ago
4 0
The answer answer is 42. 8

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48. Reading Rates The reading speed of sixth-grade students is approximately normal, with a mean speed of 125 words per minute a
son4ous [18]

Answer:

The reading speed of a sixth-grader whose reading speed is at the 90th percentile is 155.72 words per minute.

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 = 125, \sigma = 24

What is the reading speed of a sixth-grader whose reading speed is at the 90th percentile

This is the value of X when Z has a pvalue of 0.9. So it is X when Z = 1.28.

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

1.28 = \frac{X - 125}{24}

X - 125 = 1.28*24

X = 155.72

The reading speed of a sixth-grader whose reading speed is at the 90th percentile is 155.72 words per minute.

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3 years ago
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Solve if x is 3.<br> 91+x raise to power2
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X=3
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20cm rounded dto thenearest tenth
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Answer:

20cm rounded to the nearest tenth is 20cm

(っ◔◡◔)っ ♥ Hope It Helps ♥ Please Consider giving Brainliest

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Help me what to write a word phrase for each algebraic expression. Please help.
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#1:  The sum of q and 5 
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Please do as many as you can by yourself and ask questions about those that are hard for you.  

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gabrielle has $0.55 in dimes and nickels. She has 6 coins altogether. how many coins of each kind does she have?
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the answer is 5 dimes and 1 nickel.

hope this helps <3

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2 years ago
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