If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.
A. 144 cm
B. 144.1 cm
C. 144.2 cm
D. 144.4 cm
Answer:B
If the mean height of 3 boys is 142 cm. and the mean height of another 7 students is 145 cm., then the mean height of 10 students.
A. 144 cm B. 144.1 cm C. 144.2 cm D. 144.4 cm