Find the positive value of x if the standard deviation of...
Find the positive value of x if the standard deviation of the numbers 1, x + 1, 2x + 1 is 6
1
2
3
4
Correct answer is C
mean (x) = 1+x+1+2x+13
= 3x+33
= 1 + x
X(X−X)(X−X)21−xx2x+1002x+1xx22x2
S.D = √∑(x−7)2∑f
= √(6)2
= 2x23
= 2x2
= 18
x2 = 9
∴ x = ± √9
= ±3
Find the maximum value of y in the equation y = 1 - 2x - 3x2 ...
Which of the following correctly expresses 48 as a product of prime factors?...
After what length of time will N2400.00 yield an interest of N60.00 at 112% per annum?...
Simplify 1 - (7/3 x 5/4) + 3/5 ...
In the diagram, the value of x + y = 220o. Find the value of n...
calculate the surface area of a sphere of radius 7cm [Take π = 22/7] ...
In triangle XYZ, ∠XYZ = 15o, ∠XZY = 45o and lXYl = 7 cm. Find lYZl....