Any help would be much appreciated!!
Let X be a random variable with P(x=-1)=P(x=0)= 1/4 and P(x=1)= 1/2.
Let S be the sum of 25 independent random variables, each with the same distribution as X. Calculate approximately
a) P(S<0)
b) P(S=0)
c)P(S>0)
Thank you!!