Question

find the average of 1hr 15mins, 2hrs 20mins, 3hrs 25mins and 4hrs

Answer 1

1hr 15min= 75 min
2hr 20min= 140min
3hr 25min= 205min
4hr=240min
average=75+140+205+240/4=165min = 2hr 45min

Answer 2

Answer:

The average is 2 hr 45 min.

Step-by-step explanation:

We have to find the average of 1hr 15mins, 2hrs 20mins, 3hrs 25mins and 4hrs.

First of all make units same.

We know that 1 hr = 60 mins

$\text{1 h 15 mins}=60+15=\text{75 min}$

$\text{2 h 20 mins}=120+20=\text{140 min}$

$\text{3 h 25 mins}=180+25=\text{205 min}$

$\text{4 h}=4\times 60=\text{240 min}$

The formula for mean is

$Mean=\frac{\text{Sum of all observations}}{\text{Number of observations}}$

$Mean=\frac{75+140+205+240}{4}$

$Mean=\frac{660}{4}=165$

$\text{165 mins}=\text{2 hr 45 min}$

Therefore the average is 2 hr 45 min.