I am really stuck at the part where we find the percentages between the two inte

Question

I am really stuck at the part where we find the percentages between the two intervals on a probability worksheet. Can someone help me to determine what lies between (number of observations) between their mean and standard deviation?

My questions -      X-bar - S = 38.91

                          X-bar + S = 46.89

Also -                  X-bar - S = 20.95

                           X-bar + S = 27.45

How do I find the number of observations between these two in order to determine the percentage within the intervals?

Explanation / Answer

here in question 1 and 2 , both as theses values fall one std deviation away from mean hence from empirical formual 68.27 % values falls b/w them

please reply if your distribution is different then normal

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