A total of 45 boys and girls have signed up to tennis lessons over the summer.
The mean age of the 18 boys is 16.2 years.
The mean age of the 27 girls is 16.7 years.
Calculate the mean age of all 45 boys and girls.
Answer:
Total age of 18 boys = 16.2 x 18 = 291.60
Total age of 27 girls = 16.7 x 27 = 450.90
So, total age of 45 children = 291.60 + 450.90 = 742.50
The mean age is therefore = 742.50/ 45 = 16.5 years