Question

mean of 3,5,9,X,11 is 7 then x is​

Answer 1

Answer:

Mean is the sum of all the observations divided by total number of observation.

$mean = \frac{3 + 5 + 9 + x + 11}{5}$

$7 = \frac{28x}{5}$

$\frac{7 \times 5}{28} = x$

$1.25 = x$

therefore the value of x is 1.25

Answer 2

Answer:7

Step-by-step explanation:

n = 5

mean = 7

submission x = 3+5+9+X+11

= 28+X

so mean = submission x / n

7 = 28 + X/5

or, 35 = 28 + X

pr, 35 - 28 = X

so, X = 7