answer the question

Suppose we have an unfair dice and we do not know the probabilityp that it gets a six. Consider a random variable X; E {0, 1}, Vi E N that X;- = 1 if the dice rolling gives a six; otherwise X,- = 0. Set also Sn = X1 + X2 + + Xn, n E N. Estimate how many times we should roll this dice such that = S? is within 0.05 of p with probability at least 0.99