Question 1158700
a. is between +/- 2 sd . Chebyshev's says that 1-(1/sd^2) will be within this range for certain, and that is 1-(1/4) or 3/4.
b. is between +/- 2.5 sd. This means that (1- 1/6.25) will be within this range for certain, or 0.84 of the values
c. would be 95% for 2 sd s
d. would b +/- 1 sd s or between 41.7 and 62.3 (52.0+/-10.3)