mid value 15,25,35,45,55,65,75 frequency 4,8,8,16 ,12,6,4 calculated Standard deviation
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solution
Z=l_(1)+(f_(1)-f_(0))/(2f_(1)-f_(0)-f_(2))xxi
<br>
=50+(28-16)/(2(28)-16-15)xx10
<br>
=50+(12)/(56-31)xx10
<br>
=50+(12)/(25)xx10
<br>
=50+4.8=54.8
<br>
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