CONVERT TO STANDARD FORM <br>7.43 x 10^5 <br>CONVERT TO SCIENTIFIC NOTATION <br>1,200,000,000

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.

4 0

3 years ago

Read 2 more answers

PLZZ help middle school math you just have to explain how to solve it. please don't put big words so I can understand and my tea

Dafna11 [192]

Answer:

tell her you don't understand it and she'll help you ok good luck

8 0

2 years ago

The set of types of matter<br>well difined or not

Tresset [83]

Answer:

It is not well defined.

Step-by-step explanation:

Because set is a collection of well defined objet. And matter contains of solid, liquid and gas

3 0

3 years ago

Beth has already jogged 3 miles. She plans to jog less than 12 miles. Which inequality can be used to find the number of miles (

xenn [34]

Answer:

So we want to know how to write the inequality for Beth's jogging. The total number of miles Beth plans to jog cant go over 12, and she has already jogged for 3 miles, then she needs to jog for another m miles. This can be written mathematically like: 3 + m < 12. In other words: 3 miles + m miles Beth still plans to jog cant go over 12 miles.

Step-by-step explanation:

7 0

3 years ago

What is x to the power of 2 minus x?

pickupchik [31]

If you are asking what x to the power of 2 minus x is as a mathematical expression, then your answer is:

= x^2 - x

If you are asking what another equivalent expression for x^2 - x is or if you want it in factorised form, then your answer is:

= x ( x - 1 )

Hope this was helpful! <3

6 0

2 years ago

CONVERT TO STANDARD FORM 7.43 x 10^5 CONVERT TO SCIENTIFIC NOTATION 1,200,000,000