Answer:
0.0359
Step-by-step explanation:
Data provided:
mean values of three independent times are 15, 30, and 20 minutes
the standard deviations are 2, 1, and 1.6 minutes
Now,
New Mean = 15 + 30 + 25 = 65
Variance = ( standard deviation )²
or
Variance = 2² + 1² + 1.6² = 7.56
therefore,
Standard deviation = √variance
or
Standard deviation = 2.75
Thus,
Z-value = 
or
Z-value = - 1.81
from the Z-table
the Probability of Z ≤ -1.81 = 0.0359
For a <span>system of two linear equations to have more than one
solution, the lines representing the equations must coincide, i.e. must
be the same or a multiple of each other. In that case, the system will have infinitely many solutions.
</span>
Answer:
2x=1
Step-by-step explanation:
Use x for "a number"
x times 2 = 1
2x=1
which solves for 0.5 or 1/2
Answer:
x=3130/3
Step-by-step explanation:
3,125 = 5-10 + 3x
5-10+3x=3125
3x-5=3125
3x-5+5=3125+5
3x=3130
3x/3 = 3130/3
x=3130/3
I hope this helps!
Ek is nie seker ek werk nog uit maar wk dink dit is seker D
