Question

if the mean of data 2, a+1 , a, a-2 is 4 then find a
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Answer 1

Answer:

a = 5

Step-by-step explanation:

Mean = Sum of observations / Number of observations

4 = 2 + a + 1 + a + a - 2 / 4

4 x 4 = 3a + 1

16 = 3a + 1

3a  = 16 - 1

3a = 15

a = 5

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Answer 2

Answer:

5

Step-by-step explanation:

mean =sum of all observations/number of observations

2+a-1+a+a-2/4=4

3a+1/4=4

3a+1=4*4

3a+1=16

3a=16-1

3a=15

a=15/3

a=5