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xz_007 [3.2K]
2 years ago
5

The mean length of time, per week, that students at a certain school spend on their homework is 24.3 hours, with a standard devi

ation of 1.2 hours. Assuming the distribution of study
imes is normal, what percent of students spend more than 25 hours per week on homework?
Round
your answer to the nearest hundredth.
Mathematics
1 answer:
bixtya [17]2 years ago
4 0

Answer:

21.1%

Step-by-step explanation:

(25 - 24.3) / 1.2 = 0.5833 z score = 78.9%

You need the percent that spend more than 25 hrs per week, so 100 - 78.9 = 21.1%

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A triangular window has base eight feet and height six feet. What is its area?
kari74 [83]

Answer:

24 ft^2

Step-by-step explanation:

Area of a triangle

A = 1/2 b*h

We know the base is 8 ft and the height is 6 ft

A = 1/2 (8) (6)

   = 1/2 (48)

    = 24 ft^2

8 0
3 years ago
. Which of the equations below has a solution of 3? A 2 r= 6 B 6 = 2 rC 2r = 6
yaroslaw [1]

Answer:

They all have a solution of 3.

Step-by-step explanation:

Each of the equations represented are basically the same thing, therefore have the same answer.

A) 2r = 6 - You would divide 6 by 2 and you would get 3.

B) 6 = 2r - You would still divide 6 by 2, which equals 3.

C) 2r = 6 - Then again you would divide 6 by 2 to get 3.

   - <em>I hope this helps :)</em>

6 0
3 years ago
Please help. This test is very important.
kolezko [41]
<span>1. (−2/3) (16)
Enter your answer as a fraction, in simplified form.

answer: -32/3

2. What is the product of −2 1/2 and −3 1/3 ?
answer: 25/3

3. Divide.

−24/7
answer: -3 3/7

Enter your answer as a mixed number, in simplified form.

</span><span>4. A running cheetah begins to slow down. For each meter the cheetah travels, its speed changes by −3.4−3.4 kilometers per hour. The cheetah travels a total of 21.5 meters.

What is the total change in the cheetah's speed during this time?
A. 73.1 
B. 71.9
C. -71.9

answer: D. -73.1

5. Multiply.

(−0.64) (−2.5) 

answer: 1.6

Enter your answer as a decimal.

</span><span>6. Christopher recorded the low temperature each day for 1 week and recorded his results in this table.

Day Sunday Monday Tuesday Wednesday Thursday Friday Saturday
Low −5 °F ​ −8 ​°F ​ −6 ​°F ​ −8 ​°F ​ −3 ​°F 2° F 7° F
What is the average low temperature for the week?
answer: -3

7.Divide.

5/6÷−2/3
answer: -5/4 or - 1 1/4 (mixed #) or -1.25 (decimal)

8. Jerry measured and timed the descent of a diving bell spider in a large fish tank. The spider reached a position 4 1/2 inches below the surface of the water after descending at a constant rate for 1 1/2 seconds. Jerry recorded this as −4 1/2 inches.

What is the position of the spider relative to the surface after 1 second?
answer: </span>-3

<span>9. Divide.

(3 3/4) ÷ (−2 1/2)

Enter your answer as a mixed number, in simplified form.
answer: -1 1/2

10. Miko’s restaurant bill was $16. She used the expression 1.18(16) to find the total cost including an 18% tip.

Which expression is equivalent to the amount Miko paid?
</span>
<span>answer: 16 + 0.18(16)</span>
4 0
3 years ago
What is 5.4 + (-3.6)​
masya89 [10]

Answer:

1.8

Step-by-step explanation:

3 0
3 years ago
GEOMETRY! PLEASE HELP!! Select all the equations that represent the distance formula.
fiasKO [112]

Answer:

I'm pretty sure 2 and 5

Step-by-step explanation:

Hope this helps :)

8 0
3 years ago
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