Advertisements
Advertisements
प्रश्न
The mean of 200 observations is 20. It is found that the value of 180 is wrongly copied as 280. Find the actual mean.
उत्तर
Since mean of 200 observations = 20
⇒ Sum of 200 observations
= 200 x 20
= 4000
⇒ Incorrect sum = 4000
∴ Correct sum
= Incorrect sum - Incorrect value + Correct value
= 4000 - 280 + 180
= 3900
∴ Correct mean
= `"Correct sum"/"Total number of observations"`
= `(3900)/(200)`
= 19.5.
APPEARS IN
संबंधित प्रश्न
Find the mean of x + 3, x + 5, x + 7, x + 9 and x + 11.
The mean of 15 observations is 32. Find the resulting mean, if the observation is: Decreased by 7
The mean of 15 observations is 32. Find the resulting mean, if the observation is: Decreased by 20%
Find the mean of 8, 12, 16, 22, 10 and 4. Find the resulting mean, if each of the observations, given above, be: increased by 25%
The heights (in cm) of the volleyball players from team A and team B were recorded as:
Team A: 180, 178, 176, 181, 190, 175, 187
Team B: 174, 175, 190, 179, 178, 185, 177
Which team had a greater average height?
Find the median of team A and team B.
The mean of 6 numbers is 42. If one number is excluded, the mean of the remaining number is 45. Find the excluded number.
The mean of 10 numbers is 24. If one number is included, the new mean is 25. Find the included number.
Find the mean of the following data: 30, 32, 24, 34, 26, 28, 30, 35, 33, 25
(i) Show that the sum of the deviations of all the given observations from the mean is zero.
(ii) Find the median of the given data.
The daily maximum relative humidity (in percent) in Mumbai from May 1 to May 7, 1992 is given below: 64, 70, 65, 80, 75, 78
Find the mean.
The mean of 16 natural numbers is 48. Find the resulting mean, if each of the number is divided by 0.25
