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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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The sum of 5 consecutive even numbers is 310. What is the third number in the sequence?
MatroZZZ [7]
58+60+62+64+66=310
62 is the third number in the sequence 
4 0
3 years ago
A regular heptagon has an apothem of approximately 4.2 ft and a perimeter of approximately 28.0 ft.
inn [45]

Answer:

Step-by-step explanation:

If perimeter is 28 then each side is 28/7=4ft These sides can be seen as the bases of seven triangles that make up the heptagon. The apothem, 4.2ft, is the height of each of those triangles. The total area will be the sum of the areas of those seven triangles.

A=7(bh)/2

A=(7(4)4.2)/2

A=58.8 ft^2

6 0
3 years ago
What is the value of Arc tan 1?
Svetach [21]
Hi!

\arctan(1)\;or\;\tan^{-1}(1)=\dfrac{\pi}{4}
8 0
3 years ago
What is the sum of 24 and 72? Write the answer in standard form.
dimulka [17.4K]

Answer:

24 + 72 = 96

Step-by-step explanation:

20 + 70 = 90

4 + 2 = 6

90 + 6 = 96

You can first add the ones and then add the tens start always from the ones place gradually getting the higher value digit, to make it easier stack them.

   72

   24

+____

    96

7 0
3 years ago
Read 2 more answers
A movie theater charges $10 and 50 cent per ticket and five dollars per bucket of popcorn.You never buy the popcorn because you
cestrela7 [59]

Answer: Yes


Step-by-step explanation:

Yes it is, your ratio would be 10.50:1

$10.50 spent on every one ticket. if you buy more than one, a fraction would still simplify down to 10.50/1.

if you were to buy the popcorn then no it wouldn't be.

7 0
4 years ago
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