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Oksi-84 [34.3K]
3 years ago
5

(Pleave give the CORRECT answer, I will give out brainliest to this correct answer. Don't make up something to get brainliest be

cause I will know.)
Suppose that you wanted to estimate the average amount of time a middle school student spends per day exercising. You decide to do this by taking a random sample of students from your school. You will calculate the mean time spent exercising for your sample. You will then use your sample mean as an estimate of the population mean.

Think about your estimate of the average amount of time students spend exercising each day. Given a choice of using a sample of size 30 or a sample of size 50, which should you choose? Explain your answer.
Mathematics
1 answer:
Alex17521 [72]3 years ago
3 0

Answer:

Size 50

Step-by-step explanation:

You should choose the larger sample size.  This is because if you take the mean, it will help to cancel out outliers.  For instance, most people exercise half an hour.  With sample size of 10, there might be one person who doesn't exercise, thus dragging down the mean.  A larger sample size would have a greater ratio of "average" people.

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Barry is 8 years older than his sister. In 3 years, he will be twice as old as she will be then. How old is each now?
Colt1911 [192]

Answer:

Step-by-step explanation:

Present age of Barry = b

Present age of sister = s

Barry is 8 years older than his sister means if we subtract 8 from present age of Barry both will be of equal age

s=b-8 ............(1)

In 3 years means we have to add 3 in their present age

s+3=b+3

then

he will be twice as old as

2(s+3)=(b+3

2s+6=b+3

2s=b+3-6

2s=b-3...............(2)

Put the value of s from (1) to (2), we have

2(b-8)=b-3

2b-16=b-3

2b-b=-3+16

b=13

Put the value of b in (1)

s=13-8

s=5

Present age of Barry = b = 13

Present age of sister = s = 5

7 0
3 years ago
mark ordere wome balloons for a party that she is having.The balloons cost $4.50 each and there is a service fee of $12.The tota
ohaa [14]
A general equation to use for this situation is y = mx + b.

For this question, we can assume that y is total cost, m is cost per balloon, x is the amount of balloons, and b as the service fee; so we can set the equation up:

y = (4.50)x + 12

And we can further plug in the total cost to find the number of balloons purchased for the party:

79.50 = (4.50)x + 12

Now we can solve for x (number of balloons):

67.50 = (4.50)x

x = 15

The total number of balloons purchased for the party is 15.
5 0
3 years ago
the science department buys the equipment shown in the table. they bought all three items this year. in how many years will they
belka [17]

Answer:

20 years

Step-by-step explanation:

20 is the lowest common multiple of 5,4,2

8 0
3 years ago
Read 2 more answers
Explain how to subtract 247 from 538?
alexandr402 [8]
1. 538 - 247 = ?

2. 8 - 7 = 1

3. You can't subtract 3 and 4, so you have to take  number from 5 (turning it into a 4) and then you add a 1 right next to 3 (which makes it 13;13 - 4 = 9

4. 4 - 2 = 2

538 - 247 = 291

So the answer is 291.
7 0
3 years ago
I don't understand this!
Novosadov [1.4K]
Count the total number of objects. That is the denominator, which goes under the line. Then, only count the stars. That number is the numerator, which goes on top.
4 0
3 years ago
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