wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

The average of 30 numbers was calculated as 45 by a student. However, it was later realized that while calculating the average, 50 was mistakenly read as 80. What must be the correct average?

एक विद्यार्थी द्वारा 30 संख्याओं का औसत 45 निकाला गया। लेकिन, उसने बाद में पाया कि औसत की गणना करते समय, 50 को गलती से 80 पढ़ लिया था। सही औसत क्या होना चाहिए?

A
45
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
43
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
44
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
46
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 44
The wrong average = sum of the 30 numbes used initially30=45
(i) Now, 50 was mistakenly read as 80.
That is sum of 30 numbers was to be 30 less than the wrongly calculated average.
Thus, the correct average = sum of the 30 numbes used initially3045
sum of the 30 numbes used initially303030=451=44

गलत औसत = (प्रारंभ में उपयोग की गयी 30 संख्याओं का योगफल)/30 = 45 (i)
अब, 50 को गलती से 80 के रूप में पढ़ लिया गया था।
इस प्रकार, हमें समीकरण (i) के अंश में 80 को 50 में बदलना चाहिए, अर्थात अंश के मान को 80 – 50 = 30 से कम करते है।
सही औसत = (प्रारंभ में उपयोग की गयी 30 संख्याओं का योगफल – 30)/30 = (प्रारंभ में उपयोग की गयी 30 संख्याओं का योगफल)/30 – 30/30 = 45 – 1 = 44


flag
Suggest Corrections
thumbs-up
0
similar_icon
Similar questions
View More
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Averages and Alligations Concepts
QUANTITATIVE APTITUDE
Watch in App
Join BYJU'S Learning Program
CrossIcon