If 7 is the mean of 10,3,4, a, 6,9 and 10. find the value of a

a = 7

Step-by-step explanation:

I think, what you need to do, is first understand how to find the mean of anything: It's quite simple, actually, just add up all the numbers, then divide that number by the number of numbers. So, let's put it in perspective:

10, 3, 4, a, 6, 9, 10

7 is the mean. 7 is the number of numbers.

If, to find the mean is: 10 + 3 + 4 + a + 6 + 9 + 10 = 7a : 7, then: 10 + 3 + 4 + 6 + 9 + 10 = 42

42 plus what divided by 7 is the question now.

42 + a : 7 = 7

So, 7 times 7, that's 49 minus 42 and you've got your answer: 7