The mean rainfall in a city in 3 weekd is 242.2 cm.if the average rainfall in the next week is 236.8, then, what is average rainfall for all four weeks? in class 7 cbse maths data handling and probability
Answers
Answer:
Average rainfall for all four weeks = 240.85 cm
Step-by-step explanation:
We know that:
Average = Sum of all observations / No. of observations
Sum of all observations = Average * No. of observations
We have:
Average rainfall for 3 weeks = 242.2 cm
=> Total rainfall for 3 weeks = 242.2 * 3 = 726.6 cm
Rainfall for fourth week = 236.8
=> Total rainfall for all four weeks = 726.6 cm + 236.8 cm
= 963.4 cm
=> Average rainfall for four weeks = 963.4 / 4 cm
= 240.85 cm
Average rainfall for all four weeks = 240.85 cm
The average rainfall for all four weeks is 240.85
Step-by-step explanation:
No. of observations
Sum of all observations
The mean rainfall in a city in 3 weeks is 242.2cm.
242.2×3=Sum of temperature of 3 weeks
726.6=Sum of temperature of 3 weeks
We are given that the average rainfall in the next week is 236.8
Sum of temperature of 4 weeks = 236.8+726.6=963.4
Average=240.85