The average age 9f 40 students is 18 years.when tye teacher age is aslo include to calculate the average age become 19 years.what is the teachers age
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Answer: N = 40 mean = 18
Efx= 40 * 18 = 720
Let teacher weight = T
New efx = 720 + T
New mean = 19
New N = 40 + 1 = 41
N * mean = efx
41 * 19 = 720 + T
T = 59 yrs
Step-by-step explanation:
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