Question

In a set of observation 4,7,x,8,9,10, the mean is 8, then x is equal to​

Answer 1

Answer:

10

Step-by-step explanation:

Mean= Sum of all observations/total no of observations

Now,

It means

8= 4+7+8+9+10+x/6

8= 38+x/6

8*6 = 38+x

48-38 =x

10=x

Answer 2

Step-by-step explanation:

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11th

Maths

Statistics

Variance and Standard Deviation

If the mean of the data : 7...

STATISTICS

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Asked on December 26, 2019 by

Ãneesh Tadhani

If the mean of the data : 7 , 8 , 9 , 7 , 8 , 7 , λ , 8 is 8 , then the variance of this data is

EASY

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ANSWER

Mean of (7,8,9,7,8,7,λ,8)=8

8

7+8+9+7+8+7+λ+8

=8

Solving we get λ=10

Now, variance

=

N

∑(x−

x

ˉ

)

2

=

8

(7−8)

2

+(8−8)

2

+(9−8)

2

+(7−8)

2

+(8−8)

2

+(7−8)

2

+(10−8)

2

+(8−8)

2

=

8

1+0+1+1+0+4

=

8

8

=1.