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Marizza181 [45]
4 years ago
7

2. Twenty teenagers were asked the question “How many hours of sleep do get a night?”. The sample had a mean of 6.5 hours and a

standard deviation of 0.75 hours. Find the 95% confidence interval for the number of hours of sleep per night. SHOW ALL YOUR WORK THE WAY WE DID IN CLASS!
Mathematics
1 answer:
hram777 [196]4 years ago
5 0
You can get about eight or night hours at night it depends when you go to bed
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From base camp, a hiker walks 3.5 miles west and 1.5 miles north. Another hiker walks 2 miles east and 0.5 miles south. To the n
levacccp [35]

Answer:

The hikers are 5.9 miles apart.

Step-by-step explanation:

Let O represents the base camp,

Suppose after walking 3.5 miles west, first hiker's position is A, then after going 1.5 miles north from A his final position is B,

Similarly, after walking 2 miles east, second hiker's position is C then going towards 0.5 miles south his final position is D.

By making the diagram of this situation,

Let D' is the point in the line AB,

Such that, AD' = CD

In triangle BD'D,

BD' = AB + AD' = 1.5 + 0.5 = 2 miles,

DD' = AC = AO + OC = 3.5 + 2 = 5.5 miles,

By Pythagoras theorem,

BD^2 = BD'^2 + DD'^2

BD = \sqrt{2^2 + 5.5^2}=\sqrt{4+30.25}=\sqrt{34.25}\approx 5.9

Hence, the hikers are 5.9 miles apart.

8 0
3 years ago
Evaluate - 6r + s - rs for r = 5 and s = - 7.<br><br><br> A. 72<br> B. - 12<br> C. 58<br> D. - 2
gogolik [260]

Answer:

(D) -2

Step-by-step explanation:

Plug in r=5 and s=-7 to the equation:

-6(5)+(-7)-(5)(-7)

Now we can solve and simplify:

-30-7+35

Combine:

-2

5 0
2 years ago
Read 2 more answers
Match each expression to the correct point
ziro4ka [17]

Using number line and mental mathematics, the value of u = -√25, t = - 2π, s = -√68

<h3>What is a number line?</h3>

A horizontal line with evenly spaced numerical increments is referred to as a number line. How the number on the line can be answered depends on the numbers present.

The usage of the number is determined by the question that it corresponds to, such as when graphing a point.

As we can observe that

All the points lie on negative axis. The value of u = -√25 = 5

t = -2π = -2×3.14 = -6.28

s = -√68 = - 8.24

To learn more about number line from given link

brainly.com/question/22667895

#SPJ9

3 0
1 year ago
Which of the following equations describes the line shown below? Check all
Brilliant_brown [7]

Answer:

y = 7 x + 15

Step-by-step explanation:

6 0
4 years ago
Is there a difference between calculating a 30% discount and calculating the sale price of 30% off? If so, explain what the diff
Nesterboy [21]
Nope! they’re the same because for both you would find 30% of the original price and then subtract whatever 30% is from the original price
7 0
3 years ago
Read 2 more answers
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