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Can anyone solve this for me by step deviation? I want to check my calculations!

Q. If the mean of the following data is 14.7, find the values of p and q.

Class | 0-6 | 6-12 | 12-18 | 18-24 | 24-30 | 30-36 | 36-42 | Total |

Frequency | 10 | p | 4 | 7 | q | 4 | 1 | 40 |

https://www.meritnation.com/ask-answer/question/if-the-arithmetic-mean-of-the-following-distribution-is-56/statistics/5056701

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