MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Sum of n Terms

Mean of 70 va...

Question

Mean of 70 values was calculated as 400, On rechecking it was discovered that 250 was wrongly copied as 355 .The correct mean is

A

No change

No worries! We‘ve got your back. Try BYJU‘S free classes today!

B

401.5

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

398.5

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

D

None of the above

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is C $398.5$
Correct $¯ x = 400 + \frac{250 - 355}{70} = 398.5$

Suggest Corrections

thumbs-up

0

Similar questions

Q. Mean of 100 values was calculated as 155. On checking it was discovered that 42 and 26 were wrongly copied as 22 and 16. The correct means is

The mean of 40 observations was 250. It was detected that the value of 150 was wrongly copied as 110. Find the correct mean ?

Q. The average height of 30 boys was calculated to be 150 cm. It was detected later that one value of 165 cm was wrongly copied as 135 cm for the computation of the mean. Find the correct mean.

Q. The geometric mean of

10

observations on a certain variable was calculated as

16.2

. It was later discovered that one of the observations was wrongly recorded as

12.9

; infact it was

21.9

. The correct geometric mean is:

Q. The mean height of

15

154 c m

. It is discovered later on that while calculating the mean the reading

175 c m

was wrongly read as

145 c m

. The correct mean height is

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Arithmetic Progression - Sum of n Terms

MATHEMATICS

Watch in App

explore_more_icon

Explore more

Standard XII Mathematics

Join BYJU'S Learning Program

CrossIcon