1. In a class there are 30 female and 70 males. If female arrenged 60 in exam and males arrenged 72. Find the mean for the entress class
2. An average height of 10 students Calculated to be 65. Later it was discovered that are weight was musread as 40 instead of 80kg. Calculate the correct mean.
3. Uf the mean of a set of numbers is 500: a) if 10 is added to each the numberin the set, they what will be tge mean of the new set?
b) if each numbers in the set are multiplied by -5 , then what will be the mean of the new set?
