Question

If the mean of the observations x, 2x + 1, 2x + 5, 2x + 9 is 30, what is the mean of last two
observations ?
c
u t dimensione 1 od​

Answer 1

Answer:

32.6

Step-by-step explanation:

(x)+(2x+1)+(2×+5)+(2×+9)

---------------------- = 30

2

7×+15=60

7×=60-15

7×=45

×=6.428

Mean of last two observations i.e., (2x+5) and (2×+9)

2x+5+2×+9

--------- = K

2

4x+14÷2=K

4 (6.4) +7 = K ( x = 6.4)

25.6+7= K

K = 32.6 ( k= mean of last two observations )