Question

E. If the mean of 5 observations (x + 1), (x + 2), (x + 3), (x + 4) and (x + 5) is 25, find the
mean of first four observations.
a
F. Find the median of first 10 even natural numbers.​

Answer 1

Step-by-step explanation:

mean is the avg of all observations

we can take avg or simply we can equate middle term to mean

i.e., x+3=25

x=22

• now the observation are
• 23,24,25,26,27

mean is the central observation for odd number of observations or avg of central two observations for even numbers of observations

here they are even observations 23,24,25,26

• mean =(24+25)/2
• =49/2
• =24.5

Answer 2

Answer:

Step-by-step explanation:

E,   (x + 1) + (x+ 2) + (x + 3) + (x + 4) + (x + 5)  = 5 * 25 = 125

5x + 15 = 125

5x = 110

x = 22.

Mean of the first 4

= (4(22) + 10) / 4

= 24.5.

F.   2  4 6  8  10

median = 6.