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denis-greek [22]
3 years ago
11

Visually impaired students. The Journal of Visual Impairment & Blindness (May-June 1997) published a study of the lifestyles

of visually impaired students. Using diaries, the students kept track of several variables, including number of hours of sleep obtained in a typical day. These visually impaired students had a mean of 9.06 hours and a standard deviation of 2.11 hours. Assume that the distribution of the number of hours of sleep for this group of students is approximately normal. Find the probability that a visually impaired student b. obtains less than 6 hours of sleep on a typical day. Find the probability that a visually impaired student gets between 8 and 10 hours of sleep on a typical day. Twenty percent of all visually impaired students obtain less than how many hours of sleep on a typical is day?
Mathematics
1 answer:
alukav5142 [94]3 years ago
8 0

Answer:

wdwqQ

Step-by-step explanation:

WDWDQ

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Step-by-step explanation

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3 years ago
Match the following items by evaluating the expression for x = -2.
Sloan [31]

Answer:

1)  -4

2) -3

3) 1

4) -2

5) 4

Step-by-step explanation:

According to the information given in the exercise, the value of "x" is:

x = -2

Then:

1) You must substitute  x = -2 into the expresion x-2:

=(-2)-2

Now, you must evaluate:

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2) You have to substitute the given value of "x" into the second expression:

x-1=(-2)-1

Finally, evaluating, you get the following result:

=-3

3) According to the Zero exponent Rule, any non-zero number with an exponent of zero is equal to 1.

Then, substituting x = -2 into the expression x^0 and then evaluating, you get:

x^0=(-2)^0=1

4) By definition:

 a^1=a

Then, substituting   x = -2 into x^1 and evaluating, you get:

x^1=(-2)^1=-2

5) Since:

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When you substitute the given value of "x" into the last expression and then  you evaluate, you get:

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4 0
3 years ago
A money box contains only 10-cent and 20-cent coins. There are 34 coins with a total value of $5.40. How many coins of each
kow [346]
10x+20y=540
x+y=34
y=34-x

Plug in (34-x) for y:
10x+20(34-x)=540
10x+680-20x=540
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10x=140
x=14

There were 14 ten cent coins and 20 20 cent coins
4 0
3 years ago
What is the value of c such that <img src="https://tex.z-dn.net/?f=x%5E%7B2%7D%2B14x%2Bc" id="TexFormula1" title="x^{2}+14x+c" a
suter [353]

Answer:

49

Step-by-step explanation:

To find the 'c' value c=(b/2) to the second power. divide the coefficient of x by 2 and square the result.

3 0
3 years ago
Read 2 more answers
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