Lisa rolls a pair of dice 100 times. she rolls a pair of sixes 10 times. based on this she concludes that the probability of rolling a pair of sixes is 1 10 .

First step is to get rid of the square root. remember that a square root is the same as raising to the (1/2) power. see below: multiply exponents per exponent rules to get: remember you subtract exponents from the denominator and add exponents in the numerator so: simplify further: so a is the correct choice. if you don't understand this google exponent rules and it will you understand. look at the image results.