Question

Mean of 100 observations is 15 and mean of 150 observations is 16. Find mean of 250 observation

Answer 1

Answer:

Mean of 250 observation = 15.6

Step-by-step explanation:

Given that-

Mean of 100 observation = 15

So, sum of 100 observation = mean of 100 observation × 100

                                              = 15×100

Sum of 100 observation = 1500

Mean of 150 observation = 16

Sum of 150 observation = mean of 150 observation × 150

                                        = 16×150

Sum of 150 observation = 2400

So, sum of 250 observation = sum of 100 observation + sum of 150 observation

                                             = 1500 + 2400

Sum of 250 observation = 3900

Mean of 250 observation = $\dfrac{sum \ of \ 250 \ observation }{250}$

                                          = $\dfrac{3900}{250}$

Mean of 250 observation = 15.6

                                   ANSWER                    

Answer 2

Answer:

$\huge{\fbox{\fbox{\orange{\mathfrak{Answer\::18}}}}}$

Answer:18

Step by step explanation

If the mean =

$\frac{100}{15}$

15

100

Also,

$\frac{150}{16}$

16

150

Then mean of

250

will be,

$\huge{\fbox{\red{\mathfrak{To\:find\::}}}}$

As every equations are again 50% of the original number, so the given question's answer will be 18 as 100+50=150____[16]

150+50=200_____[17]

200+50=250______[18]