Answer:
31/4
Step-by-step explanation:
Leave the 7 alone for now.
0.75 is equal to 75/100
so now simplfy 75/100=3/4
now add the 7 back in
its
7 and 3/4
That can be your final answer or you can make it improper by multiplying 4 * 7 + 3
that gives you 31 and add the 4 back which is 31/4
Answer:
Example:
A bag contains 3 black balls and 5 white balls. Paul picks a ball at random from the bag and replaces it back in the bag. He mixes the balls in the bag and then picks another ball at random from the bag.
a) Construct a probability tree of the problem.
b) Calculate the probability that Paul picks:
i) two black balls
ii) a black ball in his second draw
Solution:
tree diagram
a) Check that the probabilities in the last column add up to 1.
b) i) To find the probability of getting two black balls, first locate the B branch and then follow the second B branch. Since these are independent events we can multiply the probability of each branch.
ii) There are two outcomes where the second ball can be black.
Either (B, B) or (W, B)
From the probability tree diagram, we get:
P(second ball black)
= P(B, B) or P(W, B)
= P(B, B) + P(W, B)
D) 350 degrees
(I hope that helps - let me know if I was off on something)
H= 3 V/ Ab =3 x 168/36 = 14 cm
