these 3 sums. no 7,8,9
Q7. The mean of 5 numbers is 20. If one number is excluded, mean of the remaining numbers becomes 23. Find the excluded number.
Q8. The mean of 25 observations is 27. If one observation is included, the mean still remains 27. Find the included observation.
Q9. The mean of 5 observations is 15. If the mean of first three observations is 14 and that of the last three is 17, find the third observation.
Dear Student,
Refer the link for the answer similar to your query:
Q.7 ) https://www.meritnation.com/ask-answer/question/the-mean-of-5-numbers-is-20-if-one-number-is-excluded-the/math/491326
Q.8 ) https://www.meritnation.com/ask-answer/question/the-mean-of-25-observations-is-27-if-one-observation-is-in/statistics/10766261
Q.9 ) https://www.meritnation.com/ask-answer/question/help-the-mean-of-25-observatios-is-36-out-of-thes-if-the-me/statistics/3503166
Regards
Refer the link for the answer similar to your query:
Q.7 ) https://www.meritnation.com/ask-answer/question/the-mean-of-5-numbers-is-20-if-one-number-is-excluded-the/math/491326
Q.8 ) https://www.meritnation.com/ask-answer/question/the-mean-of-25-observations-is-27-if-one-observation-is-in/statistics/10766261
Q.9 ) https://www.meritnation.com/ask-answer/question/help-the-mean-of-25-observatios-is-36-out-of-thes-if-the-me/statistics/3503166
Regards