Maths help

I do not understand how the answer is 6.31.
The question in the textbook was as follows.

The table below shows the frequency distribution for the number of petals in the flowers of a group of celandines.

Calculate the mean number of petals.


number of petals frequency 5 8 6 57 7 29 8 3 9 1

The meas number of petals would be $= \dfrac{\text{total number of petals}}{\text{total number of flowers}}$

Hi, thank you!
Can you explain how you got this?
I'll do the working out below.
Please correct it if anything goes wrong.

(5x8) + (6x57) + (7x29) + (8x3) + (9x1) 618
--------------------------------------------------- = ------- = 6.31
8 + 57 + 29 + 3 +1 98

thank you!

so if the question says find the mean number of petals we should first find the total number of petals and then divide by the frequency?

Yes. The question equivalently asks 'what is the mean number of petals per flower?' so it's just number of petals divided by number of flowers.