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3 years ago

Please help. Giving 20 points.

Mathematics

1 answer:

Nataly_w [17]3 years ago

6 0

The sample size is the number of people.

You can get the sample size by counting the completion times for each.

Sample size of men = 19

Sample size of women = 34

The mean time is the average time, so you need to add all the times for the men and divide it by the number of men and then the same for the women:

Mean time for men = 3129 / 19 = 164.68 seconds

Mean time for women = 5834 / 34 = 171.59 seconds.

The mean time taken by men is less than the women.

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What are the common factors of 12 and 28?

AlexFokin [52]

Answer: 1,2 and 4

Step-by-step explanation:

factors of 12 are : 1,2,3,4,6,12

factors of 28 are :1,2,4,7,14,28

commom factors are= 1,2,4

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2 years ago

Some friends shared 2 bags of chips. If each person got 2/3 of a bag of chips, how many friends were there?

quester [9]

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1 1/3

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3 years ago

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2 years ago

In triangle abc, m of acb = 90, cd is perpendicular to ab , m of acd is 60. and bd is 5 cm. find ad

weeeeeb [17]

Let us draw a picture to make the things more clear.

Attached is the image.

We have been given that

$\angle acd = 60 ^{\circ}$

Therefore, we have

$\angle dcb =90- 60= 30 ^{\circ}$

Now, in triangle bcd, we have

$\tan30 = \frac{5}{cd}\\
\\
\frac{1}{\sqrt 3}=\frac{5}{cd}\\
\\
cd=5\sqrt 3$

Now, in triangle acb, we have

$tan 60 = \frac{ad}{5\sqrt3} \\
\\
\sqrt 3= \frac{ad}{5\sqrt3}\\
\\
ad= 5\sqrt3 \times \sqrt 3\\
\\
ad= 5\times 3\\
\\
ad=15$

Thus, ad is 15 cm.

4 0

2 years ago

A student ate 3/20 of all candies and another 1.2 lb. Another student ate 35 of the candies and the remaining 0.3 lb. Altogether

Ipatiy [6.2K]

The correct question is
<span>A student ate 3/20 of all candies and another 1.2 lb. Another student ate 3/5 of the candies and the remaining 0.3 lb. Altogether, what weight of candies did they eat?</span>

let
x-------> total <span>weight of candies
we know that

x=(3/20)*x+1.2+(3/5)*x+0.3
</span>x=(3/20)*x+(3/5)*x+1.5----> multiply by 20----> 20x=3x+12x+30
20x=15x+30
20x-15x=30
5x=30
x=6 lb

the answer is
6 lb

8 0

2 years ago