write any 5 formal letter
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Explanation:
The mean of 10 numbers is 55
=> the sum of 10 numbers = 55×10 = 550.
When one number is included, the mean becomes 60.
the mean of 11 numbers is 60
=> sum of 11 numbers = 60×11 = 660.
The included number = sum of 11 numbers - sum of 10 numbers
=> 660 - 550
=> 110.
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Explanation:
1)Yours faithfully.
2)Yours truly.
3)With sincere appreciation.
4)Yours sincerely.
5) With sincere thanks.
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