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Romashka-Z-Leto [24]
3 years ago
13

A large sleep study involving over 5000 American teenagers examined how many hours the participants slept on the weekend. The ni

ghtly sleep times were distinctly non-normal with a mean of 10 hours and a standard deviation of 2 hours. Suppose we take a random sample of 100 nightly sleep times from this population. We can assume that the times in the sample are independent. What is the probability that the mean of these 100 sleep times is farther than 0.4 hours away from the population mean?
a) 0455
b) .02
c) 1
d) .02275
Mathematics
2 answers:
Nutka1998 [239]3 years ago
4 0

Answer:

.5

Step-by-step explanation:

Anvisha [2.4K]3 years ago
3 0

Answer:

.05

Step-by-step explanation:

Khan

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Find the length of the third side if necessary round to the nearest tenth
Fantom [35]

Answer:

8

Step-by-step explanation:

Let's call the missing side as x

Base on the pythagorean theorem, we have :
17² - 15² = x²

289 - 225 = x²

x² = 64

So, x equals 8.

Hope it helps

8 0
3 years ago
Which statements are TRUE? Select all that apply. Marisa drives 112 miles in 1 hour and 45 minutes, which means her speed is 64
valentinak56 [21]

Answer: See explanation

Step-by-step explanation:

a. Marisa drives 112 miles in 1 hour and 45 minutes, which means her speed is 64 miles per hour.

Speed = Distance / Time

= 112 / 1 45/60

= 112 / 1 3/4

= 112 × 4/7

= 64 miles per hour.

TRUE

b . If 6 pens cost $7.74, then 7 pens cost $9.03.

Cost of one pen = $7.74/6 = $1.29

Cost of 7 pens = $1.29 × 7 = $9.03

TRUE

c. If Raymond drives at a speed of 57 miles per hour, then it takes him 4 hours and 10 minutes to drive 256.5 miles.

Speed = Distance / Time

Speed = 256.5 / 57 = 4.5 = 4 hours 30 minutes

FALSE

d. If 17 identical cans of soup cost $38.59, then 3 of the cans must cost $6.81.

Cost of one can = $38.59 / 17 = $2.27

Cost of 3 cans = $2.27 × 3 = $6.81

TRUE

e. Mr. Mayes buys two dozen eggs for $8.40, which means that he pays 70 cents per egg.

A dozen = 12

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8 0
3 years ago
Rewrite the function f of x equals 7 times one half to the 3 times x power using the properties of exponents.
Artist 52 [7]

Answer:

f of x equals 7 times one eighth to the x power

Step-by-step explanation:

Given phrase,

function f of x equals 7 times one half to the 3 times x power,

\implies f(x) = 7(\frac{1}{2})^{3x}

By the power to power property of exponent,

That is,

(a^m)^n=a^{m.n}

f(x) = 7((\frac{1}{2})^3)^x

f(x) = 7(\frac{1}{8})^x

= f of x equals 7 times one eighth to the x power

8 0
4 years ago
4k+mn=n-3; solve for n
solong [7]
Since we are solving for n you have to isolate the n. Therefore, you want all the variables with an n in it on one side and all the variables without an n on the other side:) :
4k+3= -mn+n (There were a change in signs because for example you moved the -3 to the other side, therefore it can only be a negative on one side so now you have to change the sign to a positive:) hope you got that)
That would've been your answer because you cannot do anything else...Hope this helped :)

8 0
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Enter the equation of the line in slope-intercept form.
antiseptic1488 [7]

Answer:

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Step-by-step example:

4 0
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