a data set has a mean of 50 and a standard deviation of 10. if the distribution is symmetrical then what percent is between (20,80)?
choices are: 68%, 75%, 95%, 88.89%, 99.7%
mean () = 50 , sd () = 10
z score of 20 :-
z score of 80 :-
according to the empirical rule approximately 99.7 % of data lies woithin 3 sd from the mean.
so, here, approximately 99.7 % of data are there between (20,80). ]
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