Solve x2+ 25=0 what is/are the solutions?

x=-12.5

Step-by-step explanation:

x2+25=0

x2=-25

x=-12.5

Solution: A distribution consists of three components with frequencies 45 ,40 and 15 having their means 2,2.5 and 2 respectively . find combined mean

Let be the mean of first component and be the frequency of first component

Let be the mean of second component and be the frequency of second component

Let be the mean of third component and be the frequency of third component

Then we have:

Now the combined mean is:

Combined mean

Therefore, the combined mean is 2.2