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Natasha_Volkova [10]
3 years ago
14

A student reports that, of a simple random sample of 50 college u undergraduate students, 21 % were taking more than fifteen cre

dit hours we know that the student has made mistake (or maybe really did not conduct the survey). Why? A) There are . 5 0 students in the sample, so percentages should be multiples of 2% B) There are 50 students in the sample, so percentages should be multiples of 0.02% c) D) 21% of 50 students is 10.5 students, and you cannot sample a fraction of a student. Both A and C are correct. E) Both B and C are correct
Mathematics
1 answer:
algol133 years ago
6 0

Answer:

D) Both A and C are correct.

Step-by-step explanation:

If the sample contains 50 students, the percentage equivalent to each student is:

P = \frac{100\%}{50}=2\%

Each student corresponds to 2%, which means that percentages should be multiples of 2%.

21% is not a multiple of 2% and corresponds to:

n = 0.21*50 = 10.5

21% of 50 students is 10.5 students, and you cannot sample a fraction of a student.

Therefore, Both A and C are correct.

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What is the sum of all positive integers less than 300 which are divisible by 3
drek231 [11]

Answer:

14,850

Step-by-step explanation:

You need the sum of

3 + 6 + 9 + 12 + ... + 294 + 297

Factor out a 3 from the sum

3 + 6 + 9 + 12 + ... + 294 + 297 = 3(1 + 2 + 3 + 4 + ... + 98 + 99)

You need to add all integers from 1 to 99 and multiply by 3.

The sum of all consecutive integers from 1 to n is:

[n(n + 1)]/2

The sum of all consecutive integers from 1 to 99 is

[99(99 + 1)]/2

The sum you need is 3 * [99(99 + 1)]/2

3 + 6 + 9 + 12 + ... + 294 + 297 =

= 3 * [99(99 + 1)]/2

= 3 * [99(100)]/2

= 3 * 9900/2

= 14,850

4 0
2 years ago
3k - 2c + 8<br> use k = 7 and c = 4
Inga [223]

Answer:

21

Step-by-step explanation:

3 (7) - 2(4) + 8

21 - 8 + 8

13 + 8

21

6 0
3 years ago
Read 2 more answers
Sarah is going to the store to buy bread for a picnic. She needs twice as many slices of bread than cheese slices. She has 24 ch
Anastaziya [24]

Answer:

4 bags of bread

Step-by-step explanation:

8 0
3 years ago
I am driving from oakland california to erlanger kentucky. The distance is 2,364.6 miles. My gas tank gets 25 miles per gallon o
solong [7]

Answer:$1655.22

Step-by-step explanation:

The total distance from Oakland California to Erlanger Kentucky is 2,364.6 miles. The gas tank gets 25 miles per gallon on the highway. It means that total number of gallons required to cover the distance from Oakland California to Erlanger Kentucky would be

2364.6/25 = 472.92 gallons

If the gas cost $3.50 per gallon, it means that the total amount that it will cost to drive from Oakland California to Erlanger Kentucky would be

472.92 × 3.5 = $1655.22

5 0
3 years ago
Plz some one look at this
aleksklad [387]
5 : - 1/6 = 0.167     out of 10 = 1.67  out of 100 = 16.7

even number  0.33 out of 10:-  3.3 out of 100:-  33

a prime number  0.5 out of 10: 5 and out of 100:- 50

multipl of 3:- 0/33  out of 10:- 3.3 and out of 100: 33
4 0
3 years ago
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