In thefollowing frequency distribution, the frequency of the class interval (40-50) is not known. Find it, if the arithmetic mean of the distribution is 52. {:("Wages(Rs.)",10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Workes"," "5," "3," "4," "?," "2," "6," "13):}

In thefollowing frequency distribution, the frequency of the class int

1.	In thefollowing frequency distribution, the frequency of the class interval (40-50) is not known. Find it, if the arithmetic mean of the distribution is 52. {:("Wages(Rs.)",10-20,20-30,30-40,40-50,50-60,60-70,70-80),("Number of Workes"," "5," "3," "4," "?," "2," "6," "13):}
Answer» <html><body><p></p>Solution :<img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/TRJ_ECO_XI_C09_S01_017_S01.png" width="80%"/> <br/> `<a href="https://interviewquestions.tuteehub.com/tag/barx-2461082" style="font-weight:bold;" target="_blank" title="Click to know more about BARX">BARX</a>=(sumfm)/(sumf)` <br/> `<a href="https://interviewquestions.tuteehub.com/tag/52-324553" style="font-weight:bold;" target="_blank" title="Click to know more about 52">52</a>=(1,765+45f)/(33+f)` <br/> `Or, 52(33+f)=1,765+34f` <br/> `1,716+52f=1,765+45f` <br/> `52f-45f=1,765-1,716` <br/> `rArr""7f=49` <br/> `rArr""f=7` <br/> <a href="https://interviewquestions.tuteehub.com/tag/missing-1098377" style="font-weight:bold;" target="_blank" title="Click to know more about MISSING">MISSING</a> <a href="https://interviewquestions.tuteehub.com/tag/frequency-465761" style="font-weight:bold;" target="_blank" title="Click to know more about FREQUENCY">FREQUENCY</a> =7.</body></html>