Answer:
Step-by-step explanation:
3021
Answer:
4 hours
Step-by-step explanation:
X: Working hours by full-timer workers
Y: Working hours by Part-timer workers
Following the problem:
Y=2 and X-Y=2
so, clearing the equation and replacing Y value in it
X=2+Y => X=4 hours
Answer:
13: she’s wrong
Step-by-step explanation: 13: 35x2= 70 70+35=105 not = to 100
Answer:
Variance of difference between pre-exam and post-exam grades = 10.8
Step-by-step explanation:
Correlation (X,Y) = Covariance (X,Y) / √ { Variance (X) . Variance (Y) }
Given : Correlation (Pre & post exam grade) = 0.9 ; Variance (Pre exam grade) = 0.90 ; Variance (Post exam grade) = 16
So, 0.9 = Covariance (X,Y) / √ { 16 x 9 }
0.9 = Covariance (X,Y) / 12
Covariance (X,Y) = 12 x 0.9 = 10.8
Answer:
4th Option, 45.1
Step-by-step explanation:
Cos(Ф) =
Ф = Cos⁻¹ ()
Ф = 45.1
Hope this helps!