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  A data consists of n observations: x1, x2,…,  xn if 2=9n and   2 =5n, then the standard deviation of this data is:

a.

5

b.

 

c.

 

d.

2



Question ID - 56768 | SaraNextGen Top Answer

  A data consists of n observations: x1, x2,…,  xn if 2=9n and   2 =5n, then the standard deviation of this data is:

a.

5

b.

 

c.

 

d.

2

1 Answer
127 votes
Answer Key / Explanation : (b) -

=9n      … (1)

=5n       …(2)

(1)+(2) )=7n

  =6

(1) − (2) 4 =4n

  =n

  =1

 variance = 6−1=5

 standard deviation=

127 votes


127