The data set on the right represents A teacher recorded all of his students' grades on

the final exam as:

DONE

62, 77, 78, 80, 82, 82, 83, 84, 85, 87, 89,95

Consider the formulas:

A: 52_ (x1 - x* +(x2 - x)2 + ... + (xin – x)2

n-1

(y - x)+(x2-x+ +(An - x}}

n-1

co2

(x2 – 40)2 + (x2 – 42+ +(x3 - ?

B. SE

(x2 - 4) + (x2 - 4 +

N

+(9-4)

The correct option is C

(SEE THE ATTACHMENT)

Step-by-step explanation:

The question is unclear because the options given doesn't make any sense. We can consider the questions incomplete, After searching the internet, I found out what was the question and its options actually are. I hope it helps

(YOU CAN SEE THE ATTACHMENT BELOW)

Q) WHICH FORMULA SHOULD BE USED TO CALCULATE VARIANCE?

ANSWER)

We know that there are 2 types of variance, Population variance and sample variance. As in this question, we are considering all the values of the data to find variance. we'll find Population Variance. If we would considered only some values (sample) from the data (population), we would have considered to find sample variance.

Population Variance is given as sigma squared which is calculated by sum of square variables minus mean, divided by number of observation in population.

which is represented by option C

for the points

step-by-step explanation:

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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