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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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2 years ago
James has 14{,}500\text { g}14,500 g14, comma, 500, start a text, space, g, end text of sand in his sandbox. He brings home anot
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Question:

James has 14,500g of sand in his sandbox. He brings home another 7,400g of sand from the beach to add to his sandbox. How many kilograms of sand does James have in his sandbox now?

Answer:

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Step-by-step explanation:

Given

Initial quantity of sandbox = 14,500 g

Additional quantity = 7,400 g

Required

Total quantity of sandbox in kg

Tp get the total quantity of sandbox, we simply add in the initial and additional quantity of sandbox together;

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Total = Initial Quantity + Additional Quantity

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But the question says the answer should be in kg

1000 g is equivalent to 1 kg

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21,900g = 21.9 kg

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7 0
3 years ago
The hour hand is between the 3 and the 4. The minute hand is 1 tic mark after the 5. What time is it?
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Hello!

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3 0
3 years ago
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