Question 71
The mean height of 30 students was given as 140 cm. It was later observed that one of the observations was incorrectly copied as 121 cm while it was actually 134 cm. What was the correct mean height? [Give your answer correct to one place of decimal.]
Solution
The mean height of 30 students was given as 140 cm.
Total height of 30 students initially = $$140\times30$$ = 4200
It was later observed that one of the observations was incorrectly copied as 121 cm while it was actually 134 cm.
Correct mean height = $$\frac{4200-121+134}{30}$$
= $$\frac{4213}{30}$$
= 140.433333
= 140.4 cm
Get AI Help
Create a FREE account and get:
- Free SSC Study Material - 18000 Questions
- 230+ SSC previous papers with solutions PDF
- 100+ SSC Online Tests for Free
Free SSC Topicwise Questions
SSC Data InterpretationSSC GeometrySSC Linear EquationsSSC Number SystemsSSC Quadratic EquationsSSC TrigonometrySSC AgesSSC ArithmeticSSC Reading ComprehensionSSC VocabularySSC AnalogySSC Coding DecodingSSC DirectionsSSC Meaningful OrderSSC Number SeriesSSC PuzzlesSSC SyllogismsSSC Words FormationSSC Venn Diagram
