-1 vote
The average temperature of the first three days is 27°C, and that of the next three days is 29° C, if the average of the entire week is 28.5°C, then the temperature of the last day is_
The average temperature of the first three days is 27°C, and that of the next three days is 29° C, if the average of the entire week is 28.5°C, then the temperature of the last day is_
1). 31.5°C
2). 10.5°C
3). 42°C
4). 36°C
1 answers
-1 vote
Average = Sum of quantities/Total number of quantities
Given, average temperature of the first three days is 27°C, and that of the next three days is 29° C.
Sum of temperatures for first six days = 27 × 3 + 29 × 3 = 168° C.
Let the temperature on the last day be ‘t’.
Thus average temperature of the week $(= \frac{{168 + t}}{7})$
Given, average of the entire week is 28.5°C.
$(\therefore \frac{{168 + t}}{7} = 28.5)$
⇒ 168 + t = 199.5
⇒ t = 31.5° C