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ICSE Class 10 Answered

find the mean of 25 number if the mean of the first 15 is 18 and the mean of the rest is 13
Asked by Protyusha | 13 Mar, 2018, 04:20: PM
answered-by-expert Expert Answer
begin mathsize 16px style bold To bold space bold find bold space colon thin space Mean space of space 25 space numbers equals ? bold Given space space colon Mean space of space the space first space 15 space numbers space is space equals 18 space space space space space space space space space space space space space space Mean space of space the space last space 10 space numbers space is space equals 13 bold Solution bold colon Sum space of space 15 space numbers space equals space mean space cross times space numbers space of space terms space equals space 18 cross times 15 space equals 270 Sum space of space 10 space numbers space equals space mean space cross times space numbers space of space terms space equals space 13 cross times 10 space equals 130 Therefore space Total space Sum space of space 25 space numbers space equals space 270 space plus 130 space equals space 400 Therefore space space Mean space of space 25 space numbers space equals space 400 over 25 space equals 16 Therefore space the space Mean space of space 25 space numbers space is space 16. end style
Answered by Yasmeen Khan | 13 Mar, 2018, 05:18: PM

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