Question

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​

Answer 1

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

Answer 2

The average rainfall for all four weeks is 240.85

Step-by-step explanation:

$Average = \frac{\text{Sum of all observations}}{\text{No. of observations}}$

No. of observations

Sum of all observations

The mean rainfall in a city in 3 weeks is 242.2cm.

$\begin{gathered}242.2 = \frac{\text{Sum of temperature of 3 weeks}}{3}\\242.2 \times 3 = \text{Sum of temperature of 3 weeks}\\726.6=\text{Sum of temperature of 3 weeks}\end{gathered}$

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

$\begin{gathered}Average = \frac{\text{Sum of temperatures of 4 weeks}}{4}\\Average = \frac{963.4}{4}\\Average = 240.85\end{gathered}$

Average=240.85

Hence the average rainfall for all four weeks is 240.85

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