Question

The mean of the observations x, 2x+1, 2x+5 and 2x+9 is 30.What is the mean of first two observations?​

Answer 1

Answer:

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Step-by-step explanation:

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Answer 2

Answer:

1. x=3 2+9=11 2+5=7 2+1=3 , 11+7+3=21 30-21=9 9÷3=3

Step-by-step explanation:

2×3+1,2×3+5,2×3+9=30