Question

The mean of 7 observations of a data is 13 .if 6 of the observations are 12,11,14,15,13,and 17. find the missing observations of the data.​

Answer 1

Missing observation is 9

Step-by-step explanation:

mean= sum of the observation / no. of observation

x^bar= sigma x/ n

suppose that missing no.is x

sum of observation= 12+11+14+15+13+17+x

=82+ x

no. of observation= 7

mean= sum of the observation / no. of observation

13=(82+x)/7

13×7=82+x

91=82+x

x=91-82

x=9

Answer 2

Answer:

Correct option is

B

14

Sum of all observations =13×14=182

Sum of the first 7 observations =7×12=84

Sum of the last 7 observations=7×16=112

Sum of the first 7 observations + Sum of the last 7 observations = sum of total terms + 7

th

term$$

⇒84+112=182+7

th

term

Therefore, 7

th

term =196−182=14

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