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2 years ago

I uploaded the answer to a file hosting below

Mathematics

1 answer:

lutik1710 [3]2 years ago

3 0

Answer:

C. is awnser

Step-by-step explanation:

Can I have brainliest * if wrong then D

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The average reading speed of students completing a speed-reading course is 435 words per minute (wpm). If the standard deviation

nekit [7.7K]

Answer:

$Z = -1.58$

Z = -1.58 means that a reading speed of 340 wpm is 1.58 standard deviations below the mean reading speed.

$Z = 0.67$

Z = 0.67 means that a reading speed of 475 wpm is 0.67 standard deviations above the mean reading speed.

$Z = -0.25$

Z = -0.25 means that a reading speed of 420 wpm is 0.25 standard deviations below the mean reading speed.

$Z = 2.92$

Z = 2.92 means that a reading speed of 610 wpm is 2.92 standard deviations above the mean reading speed.

Step-by-step explanation:

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 a measure X is above or below the mean.

In this problem, we have that:

$\mu = 435, \sigma = 60$

a. 340 wpm

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

$Z = \frac{340 - 435}{60}$

$Z = -1.58$

Z = -1.58 means that a reading speed of 340 wpm is 1.58 standard deviations below the mean reading speed.

b. 475 wpm

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

$Z = \frac{475 - 435}{60}$

$Z = 0.67$

Z = 0.67 means that a reading speed of 475 wpm is 0.67 standard deviations above the mean reading speed.

c. 420wpm

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

$Z = \frac{420 - 435}{60}$

$Z = -0.25$

Z = -0.25 means that a reading speed of 420 wpm is 0.25 standard deviations below the mean reading speed.

d. 610wpm

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

$Z = \frac{610 - 435}{60}$

$Z = 2.92$

Z = 2.92 means that a reading speed of 610 wpm is 2.92 standard deviations above the mean reading speed.

6 0

2 years ago

4) The mass of a chest is 498 kg when it is 1/2 filled with treasure.

mote1985 [20]

Answer:

926kg

Step-by-step explanation:

712kg-498kg=214kg+712kg=926kg

3/4. 2/4. 1/4. 3/4. 4/4

3 0

2 years ago

Read 2 more answers

A triangular playground has angles with measures in the ratio 8:3:9. What is the measure of the smallest angle? I need an explan

frozen [14]

Answer:

Measure of smallest angle will be 27 degrees.

Step-by-step explanation:

We are told that a triangular playground has angles with measures in the ratio 8:3:9 and we are asked to find out measure of smallest angle.

Since we know by the angle sum property that angles in a triangle add up to 180 degrees.

We can set an equation from our given ratio as:

$8x+3x+9x=180^{o}$

$20x=180$

$x=\frac{180}{20}$

$x=9$

Now we will find measure of our smallest angle by multiplying 3 by 9 as 3x will be smallest angle of our triangle.

$3*9=27$

Therefore, measure of the smallest angle will be 27 degrees.

4 0

3 years ago

90 degrees 45 degrees X Whats x?

Fiesta28 [93]

Answer:

x = 45

Step-by-step explanation:

Each corner of the square is a right angle measuring 90 degrees.

x + 45 = 90

x = 45

5 0

3 years ago

|x| = -5 Select a he graph of the solution. Click until correct graph appears

Gnoma [55]

Answer:

No solution

Step-by-step explanation:

No solution.

You could graph y = |x| and then graph y = -5. You'd see quickly that these two graphs never intersect.

The absolute value function y = |x| can only be zero (0) or positive.

5 0

2 years ago