1.
SHORT ANSWER QUESTIONS :
Pocket money (in ) received by 7 students are 78,82,76,84,80,72,74.
Find the range and also find the mean.
Sol:
Answers
Answer:
mean = sum of observation. 546
------------------------------------- = -------- = 78
Number of observations. 7
range = largest observation-smallest observation
= 84-72 = 12
Answer:
First, arrange the observations in increasing order.
Mean = Sum of observations
- - - - - - - - - - - - - - - - - - - - - - -
Total number of observations
= 7
- - - - - - - - - - - - - - - - - - - - - -
72 +74 +76 +78 + 80+ 82 + 84
= 7
- - - - - - - - - - - - - - - - - - - - - - -
546
= 78
Range = Highest observation - Lowest Observation
= 84 - 72
= 12
This is ungrouped data.