the mean score of a group of 20 students is 65. 2 other students whose scores are 89 and 85 were added to the group. what is the new mean of the group of students ?
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Step-by-step explanation:
Mean of 20 students = 65
Sum of 20 students = 65 × 20 = 1300
Now, the new sum = 1300 + 89 + 85 = 1494
No. of students = 12
New mean = 1494/12 = 124.5
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