# What is the mean of first 7 triangular number's ?

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- sepiaLv 71 month ago
The mean of the first 7 triangular numbers:

(84/7) = 12

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- Anonymous1 month ago
first 7 triangular numbers : 1 3 6 10 15 21 28

Σ (1 3 6 10 15 21 28)/7 = 84/7 = 12

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- Engr. RonaldLv 71 month ago
{ 1, 3, 6, 10, 15, 21,28}

mean = ( 1 + 3 + 6 + 10 + 15 + 21+28)/7 = 84/7 = 12 answer//

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- llafferLv 71 month ago
Triangular numbers are created by adding the next whole number to the previous term. So the first 7 numbers are:

1, 3 (added 2 to 1), 6 (added 3 to 3), 10 (added 4 to 6, etc), 15, 21, 28

Now we just get the mean of this data set:

(1 + 3 + 6 + 10 + 15 + 21 + 28) / 7

84/7

12

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