Question

If the mean of 5 observations is 15 and that of another 10 observations is 20, then the mean of all 15 observations is

Answer 1

Answer:

Step-by-step explanation:

Mean of 5 observations is 15, then the sum of 5 observations = 75 [ 15x5=75]

Mean of 10 observations is 20,then the sum of 10 observations = 200[20x10=200]

Now, the sum of all the 15 observations = 75+200

                                                                  = 275

Mean of 15 observations = 275/15

                                          =18.3