Mean Flashcards

1
Q

What is mean?

A

It is the total sum of all values divided by the number of values

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2
Q

Given the following scores in a test

5, 6, 7, 8, 9, 10

How many scores are there?

A

6

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3
Q

Given the following scores in a test

5, 6, 7, 8, 9, 10

What is the total score?

A

5 + 6 + 7 + 8 + 9 + 10 = 45

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4
Q

Given the following scores in a test

5, 6, 7, 8, 9, 10

What is the mean score?

A

45/6 = 7.5

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5
Q

Given the following scores in a test

5, 6, 7, y, 9, 10

How many scores are there?

A

6

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6
Q

Given the following scores in a test

5, 6, 7, y, 9, 10

What is the total score?

A

5 + 6 + 7 + y + 9 + 10 = 37 + y

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7
Q

Given the following scores in a test

5, 6, 7, y, 9, 10

If the mean score is 7.5, what is the total?

A

6 * 7.5 = 45

The total can be calculated by multiplying the number of scores and the mean score

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8
Q

Given the following scores in a test

5, 6, 7, y, 9, 10

If the mean score is 7.5, how do find the value of y?

A

We form the equation

y + 37 = 45

y = 45 - 37

= 8

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9
Q

Complete the table

A
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10
Q

How do we calculate mean number of children each family has?

A

We take the total number of chidren divided by the total number of families

45/30 = 1.5

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11
Q

How many friends are there in the table?

A

2 + 2 + 4 + 10 + 8 = 26

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12
Q

How many dvd’s are borrowed?

A

2 * 0 + 2 * 1 + 4 * 2 + 10 * 3 + 8 * 4

= 0 + 2 + 8 + 30 + 32

= 72

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13
Q

How is the mean number of dvd’s are borrowed?

A

72/26 = 2.77 (3 s.f.)

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14
Q

The data shows the number of hours students spent on the internet everyday

How many students were surveyed?

A

2 + 2 + 6 + 3 + 2 + 1 = 16

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15
Q

The data shows the number of hours students spent on the internet everyday

How many hours did all the students spent on the internet?

A

2 * 0 + 2 * 1 + 6 * 2 + 3 * 3 + 2 * 4 + 1 * 7

= 0 + 2 + 12 + 9 + 8 + 7

= 38

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16
Q

The data shows the number of hours students spent on the internet everyday

What is the mean number hours the students spent on the internet?

A

38/16 = 2.375 h