It’s a frequency table, you find the middle number from the prices of mail received and you would multiply it. Not sure what with but if you search on Google Frequency tables there should be a good explanation.
Hope this helped you!
Answer:
please upload the figure so i could help you :)
Step-by-step explanation:
I am pretty sure it is linear decrease,
Dude, you could just use a calculator but the answer is 51.
