Question 1189188
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<pre>

Frequency distribution table shows how many times {{{n[i]}}} would you expect 
appearing of some value {{{x[i]}}} of discrete random variable X through the N experiments. 


Frequency distribution table has two arrays: {{{x[i]}}}  and {{{n[i]}}}.
 

To find the mean  " m ",  use the formula  m = {{{(1/N)*sum(x[i]*n[i], i=1,N)}}}. 


To find the standard deviation " d ",  use the formula  d = {{{sqrt((sum(n[i]*(x[i]-m)^2,i=1,N))/N)}}}.
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As a reference, &nbsp;see this link


http://sceo.archives.math.ca/edu/power-pouvoir/ch12/5214891-eng.htm




For an appropriate ONLINE standard deviation calculator for data given as a frequency table, &nbsp;see the link


https://www.hackmath.net/en/calculator/standard-deviation