Answer:
There was 32.5mm of rainfall on the seventh day.
Step-by-step explanation:
Mean of a data-set:
The mean of a data-set is the sum of all values of a data-set divided by the number of values in the data-set.
The mean daily rainfall for a week was 5.5mm.for the first six days the mean rainfall was 1mm.
This means that during the week(7 days), the total amount of rain was of:
[tex]6*1 + x = 6 + x[/tex]
How much rainfall on the seventh day ?
This is x. We have that:
[tex]\frac{6 + x}{7} = 5.5[/tex]
[tex]6 + x = 7*5.5[/tex]
[tex]6 + x = 38.5[/tex]
[tex]x = 38.5 - 6 = 32.5[/tex]
There was 32.5mm of rainfall on the seventh day.
