Question

if the mean of the observations x, 2x+1, 2x+5, 2x+9 is 30. what is the mean of last two observations?

Answer 1

Answer:

answer is 37

Step-by-step explanation:

the value of x is 15 and than substitute the value of x in last two observation

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Answer 2

Answer:37

Step-by-step explanation:x+2x+1+2x+5+2x+9/4=30

7x+15/4=30

7x+15=120

7x=105

x=15

2×15=30+5=35

2×15=30+9=39

35+39=74

mean=74/2

37