MTS 21 22-07-2022 Shift 3


Question 1

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.]

30 विद्यार्थियों की माध्य (औसत) ऊंचाई 140cm दी गई थी। बाद में यह पाया गया कि प्रेक्षणों में से एक को गलत
तरीके से 121cm  के रूप में कॉपी किया गया था जबकि वह वास्तव में 134 cm था। सही माध्य ऊंचाई क्या होगी?
[दशमलब के बाद एक स्थान तक पूर्णाकित]


Options

A

B

C

D


Solution:

Correct Answer:

D


Total No. of students = 30 

Mean height = 140 cm

Error = 134 - 121 = 13

Correct mean height = 140 + 1330\frac{13}{30} = 140 + .43 = 140.4

 कुल विद्यार्थियों की संख्या = 30 

विद्यार्थियों की माध्य (औसत) ऊंचाई = 140 cm

त्रुटि = 134 - 121 = 13

सही माध्य ऊंचाई = 140 + 1330\frac{13}{30} = 140 + .43 = 140.4

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