If the mean of 5 numbers is 10 and the mean of other 15 numbers is 20, what is the combined mean of both 20 numbers.
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Answer:
17.5
Step-by-step explanation:
mean of 5 numbers=10
total sum of 5 numbers=5×10=50
mean of 15 numbers=20
total sum of 15 numbers=15×20=300
mean of all 20 numbers=300+50/20
=350/20=17.5
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