Question

The mean of 5 observation is 15.If mean of first three observations is 14 and that of the last three is 17,find the third observation.

Answer 1

Given that Mean of 5 observations is 15.

Therefore the sum of observations = 15 * 5 = 75.

Given that mean of the first 3 observations is 14.

Therefore the sum of first three observations = 14 * 3 = 42.

Given that mean of the last 3 observations is 17.

Therefore the sum of the last three observations = 17 * 3 = 51.

Hence,

The third observation = (42 + 51) - 75

                                    = 93 - 75

                                    = 18.

Step-by-step explanation:

Answer 2

Answer:

18

Step-by-step explanation:

Mean of 5 observations = 15

So, sum of 15 observations is 75.

Similarly, sum of first 3 obs. = 42

               sum of last 3 obs. = 51

Third observation = (42 + 51) - 75

                              = 93 - 75

                              = 18