Question

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my warden will comes to rounds ...
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ANSWER THE QUESTION....

Answer 1

Answer:

Step-by-step explanation:

current mean=9

if each observation is increased by 3 , then

accrding to theorem : the mean will be added with that number

=9+3=12

so the new mean is 12

                           hope it helps

Answer 2

Hey!

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Observations is 10
Mean is 9

We know,
Observations be (x1 , x2 , x3 ... x10)

For sum of 10 observations we have mean 9, using the formula,

Mean = x / number of observations

Sum of observations = Mean × Number of observations

Sum = 9 × 10
Sum of observation = 90

So, when it is increased by 3 then,

[ Note : In That " Ex1 " , " E " is actually the summation sign ]

Sum of observations Ex1 =
(x1 + 3 , x2 + 3 , x3 + 3 ... x10 + 3) × 10

= [ (x1 + x2 + x3 ... x10) + 3 ] × 10

= (9 + 3 ) × 10

= 12 × 10

= 120

So,
Mean = Ex1 / no. of new observations

Mean = 120 / 10

Mean = 12

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Hope it helps...!!!