Question

a list of 9 numbers has a mean of 4.6 what number must be added to the list to make the mean 5 ?
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Answer 1

Answer:

Mean of 9 no is 4.6

              means,

                          ⇒ Sum of list of 9 no/ 9 = 4.6

                          ⇒ Sum of list of 9 no = 4.6 * 9

                                                    = 41.4

If any no is added to list total numbers in list  will be 10

            means in that case we are having

                       ⇒ Sum of list of 10 no/10 = 5

                       ⇒ Sum of list of  10 no = 50

Sum of list of 10 no is 50 and,

sum of list of 9 no is 41.4

Let to list of 9 no 'x' is added to make its mean 5

                              means we can say

                                 Sum of list of 9 no + x = Sum of list of 10 no

                                 41.4 + x = 50

                                            x = 50 - 41.4

                                            x = 8.6

Answer ;

No to be added is 8.6

I Hope you get it. Thanks !!!!!