The average height of 21 girls was recorded as 148 cms. The teacher’s height was added and the average increased by one. What was the teacher’s height?
Total height of girls=21*148=3108
After teacher's height is included, No. Of persons =22
Average height=148+1=149
Total height=22*149=3278
Teacher's height = 3278-3108 = 170cms.
Option C is the right answer.
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