Answer:
Step-by-step explanation:
Let X be the random variable for the time needed to grade a randomly chosen first examination paper
X is N(5, 4)
a)
Time taken=11.00-6.50=4hours 10 min=25/6 hours
P(X<25/6) =P(Z<
=0.5-0.0832=0.0168
b) Time >11.10-6.50 = 4 hours 20 mint = 13/3 hours
P(X>13/3) = P(Z>-0.16) = 0.5636
Answer:
chance of winning $100 = 1/1000
chance of winning $50 = 5/1000 = 1/200
cost of ticket = -1
E[x] = 100* 1/1000 + 50* 1/200 -1
= 0.1 + 0.25 - 1 = -0.65
Step-by-step explanation:
hope this helps
Answer:
C
Step-by-step explanation:
1) you can tell that one of the pre-images sides is 2 units and the corresponding image's is 1 so you can assume the scale factor is 2, also the preimage is on one side of the x axis and the image is on the other.
Answer: I’m not a sinner ..
Step-by-step explanation:
Answer:
22
Step-by-step explanation: