Question

mean of 15 observations was found to be 250 but later on it was discovered that 165 was misread as 115 find the correct mean​

Answer 1

Answer:

738/3 or 249.3

Step-by-step explanation:

1. $mean = \frac{sum}{no}$
2. $250 = \frac{sum}{15}$
3. $sum = 250 \times 15 = 3750$
4. now
5. $165 - 115 = 10$
6. therefore corrected sum is
7. $3750 - 10 = 3740$
8. corrected mean is
9. $\frac{3740}{15} = \frac{748}{3}$

or 249.3

hope it helps