Lena works in a bakery and wanted to work out the average number of people that come into the bakery at lunchtime. She recorded how many people visited over a month.
Estimate the mean of the grouped frequency to the nearest whole number.

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.

It’s either a or c as the answer.