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zhenek [66]
2 years ago
14

Can you help me on problem 1 of Three-Dimensional Figures

Mathematics
1 answer:
svlad2 [7]2 years ago
4 0
The answer is D) isosceles and equilateral triangle 
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Suppose on a certain test, fifty students earn a perfect score and fifty students earn a zero. determine the mean grade and stan
kodGreya [7K]

Answer:

Mean=50.

standard deviation=50.

Step-by-step explanation:

Let the perfect score be 100.

The mean(average) of a data is given by: Mean=\frac{sum of data points}{number of data points}

Here the number of data points are 100. out of which 50 attains a value 100,and 50 attains value 0.

so, sum of data points=50×100+50×0=5000.

Mean=\frac{5000}{100}

Mean=50.

"Now the standard deviation of data points are calculated by firstly subtracting mean from every entry and then square the number and take it as new entry and calculate the mean of the new data entry and lastly taking the square root of this new mean".

Here if 50 is subtracted from each entry the new entry will have 50 entries as '50' and 50 entries as '-50'.

next on squaring we will have all the 100 entries as '2500'.

now the mean of these entries is: \frac{2500\times100}{100}

                                                         =2500

taking it's squareroot we have \sqrt{2500}=50

Hence, standard deviation=50.




5 0
3 years ago
Read 2 more answers
Marisa has 37 jelly beans. She eats some and has 16 left. How many jelly beans did she eat?
tiny-mole [99]
She ate 21 jelly beans
7 0
3 years ago
Please help me ! geometry help greatly needed. asap if possible.
Ugo [173]

Answer:

b)52

Step-by-step explanation:

360-120-136=104

104%2=52

7 0
2 years ago
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When three squares are joined at their vertices to form a right triangle, the combined area of the two smaller
olga55 [171]

Answer:

Top right (one what has 16cm^2 and 9cm^2)

Step-by-step explanation:

The one in the top right and even though I cannot see what the area is of the biggest square, I can tell what it should be the two smaller squares combined

Hope this helps :)

5 0
2 years ago
In what place is the 7 in 47,189,274
juin [17]
Millions I think yeah
5 0
3 years ago
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