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LuckyWell [14K]
3 years ago
9

According to the Department of Education, college students spend an average of 150 minutes per day on their phones with a standa

rd deviation of 75 minutes. Suppose a random sample of 36 college students is taken and the mean time is spent on phones is recorded.
(a) What is the probability that sample mean is less than 140 minutes per day?
Mathematics
1 answer:
Nuetrik [128]3 years ago
6 0

the answer is in the question

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A triangle has a perimeter of 51 cm. If the three sides of the triangle are n, 4n-4, and 4n-8, what is the length of each side?
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Answer:

see below

Step-by-step explanation:

The three sides add to 51

n      +    4n-4    +   4n-8   = 51

9n -12 = 51

9n = 63

n = 7        4n-4 = 24      4n-8 = 20  

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Step-by-step explanation:

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Find the measure of the indicated angle to the nearest degree
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7 0
2 years ago
What is the surface area of the prism in square inches?
Kay [80]

<u>Given</u>:

Given that the triangular prism with height 10 inches.

The side lengths of the base of the triangle are 12 inches, 13 inches and 5 inches.

We need to determine the surface area of the prism.

<u>Surface area of the prism:</u>

The surface area of the prism can be determined using the formula,

SA=bh+(s_1+s_2+s_3)H

where b is the base and h is the height of the triangle.

s₁, s₂, s₃ are the side lengths of the triangle and

H is the height of the prism.

Substituting b = 12, h = 5, s₁ = 12, s₂ = 5, s₃ = 13 and H = 10 in the above formula, we get;

SA=(12)(5)+(12+5+13)(10)

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Thus, the surface area of the triangular prism is 360 square inches.

Hence, Option b is the correct answer.

8 0
3 years ago
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