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miskamm [114]
3 years ago
13

What is the first error he made in computing the standard deviation?

Mathematics
2 answers:
artcher [175]3 years ago
7 0
B.yuri divided by n instead of n-1
vivado [14]3 years ago
6 0

Answer:

Step-by-step explanation:

Given is a sample with 4 items as

12,9,14,21

Mean = average of 4 = 14

s is the square root of sample variance

Sample variance is the sum of squares divided by n-1

But Yuri divided by 4 = n instead of 3 = n-1

That is the only mistake he did and all other steps are right.

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Answer:

part a: answer b. 0.75x + 0.15y = 90

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It’s not 99/130 MARKING BRAINLIEST!!
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Answer:

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Step-by-step explanation:

101/130 (C) is your answer

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Solve the following system of equations using matrices:<br><br> 4x + 5y = 40<br> X-y=1
Sergeeva-Olga [200]
I think i’m not sure but i think the answer is (5,4) x=5 and y=4
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Bob order 151/2 pound of cherrys fron the farm,this year they want to order 1 1/4 more pound but then 2/5 of the order they want
noname [10]

Answer:

Percentage of cherries    = 60 %

Percentage of berries  = 40 %

Step-by-step explanation:

He orders  15 1/2 pounds every year.

He wants more=  1 1/4 pounds

So the total pounds = 15 1/2 + 1 1/4

                                 = 15 + 1 + 1/2 + 1/4

                                 = 16 + (2+1)/4

                                  =   16 + 3/4

                                  = 16 3/4 pounds

Out of 16  3/4 pounds they want 2/5 part to be of blue berries.

So blue berries = 16 3/4 * ( 2/5)

                          = 67/4 * ( 2/5)

                            = 67/10 = 6 7/10 pounds

Amount of cherries= 16  3/4- 6 7/10

                                 = 10 3/4- 7/10

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                                   = 10 1/20 pounds

Percentage of cherries = Amount of cherries/ Total amount * 100

                                      = 201/20 / 67/4 *100

                                         = 201/20 * 4/67 *100

                                         = 201/335 *100

                                          = 60 %

Percentage of berries = 100- 60 = 40 %

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3 years ago
A quadrilateral has four angles.
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I hope this helps you

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