Mean, variance & SD for grouped data

[@dannyalbert8005]

finally someone not wasting your time, good job!

[@robertmitchell8630]

wow you are a life saver
it 5 am in USA and i tried and couldnt work this out following the text book
got it first time with your video

[@mamiemini]

Is the formula for variance a special case here? What I learned is f(Mid-mean)^2 but you use f*mid^2-mean^2

[@anummubashar6519]

Thanks a million for this video. It helped me a lot. God bless you.

[@MangiPNG-p3w]

The standard deviation formulae is clearly wrong in this video. The final standard deviation is supposed to be £9 610.1

[@0001rbn]

Thank you. The video was very helpful. Any idea how to handle grouped data that contains an end group that does not have the same range as the other groups? For example, age groups for every five years and then the last group is only 2 years.

[@sumeiyyakhalidabdalla9092]

4 but less than 8, will it be 4- 7

[@tehboxface]

wow thanks