Heres the question..
A box contains 3 red blocks, 7 blue blocks, and 4 white blocks. If a block is selected at random, what is the probabiliy of selecting a white block.
A. 7/14 C. 3/7
B. 5/14 D. 2/7
2007-10-10 14:14:58 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
The answer is 2/7
You take the total number of blocks that you have which is 14 and that becomes your denominator
Then you are looking for a white block so there are only 4 so that becomes your numerator
4/14 = 2/7
2007-10-10 14:17:59 · answer #1 · answered by Ms. Exxclusive 5 · 1⤊ 0⤋
D. 2/7
There are 4 white blocks and (3+7+4)=14 blocks total. The probability is the number of "successes" (getting a white block) divided by the total number of possible occurences. So,
Probability of selecting white block at random = 4/14 = 2/7.
2007-10-10 14:19:50 · answer #2 · answered by language is a virus 6 · 1⤊ 0⤋
There are 4 white blocks out of a total of 14 blocks: 4/14 = 2/7 = D
2007-10-10 14:18:48 · answer #3 · answered by L B 4 · 1⤊ 0⤋
P(a) = probability to selected a white block
definition of probability:
P(a) = (# possible events)/(#total events)
Explanation:
1)When you selected a block in the box you have 4 chances
to have a white block.
2) # Total events = 3+7+4 = 14
3) What's the probability of selecting a white block?
solution :
P(a) = P(white block) = 4/(3+7+4)
= 4/14
= 2/7
Answer : D. 2/7
2007-10-10 14:30:59 · answer #4 · answered by frank 7 · 1⤊ 0⤋
D. 2/7
There are 4 white and 14 total blocks.
4/14=2/7
2007-10-10 14:18:22 · answer #5 · answered by Ariel 2 · 1⤊ 0⤋
Okay, so there's 14 blocks overall, and 4 of them are white.
A probability generally shows the number out of the whole, thus the number of white blocks out of total blocks. So your probability is 4/14, which simplifies to:
D. 2/7
2007-10-10 14:19:11 · answer #6 · answered by Tricia 2 · 1⤊ 0⤋
No. of white = 4
Total no. = 14
P(white) = 4 / 14 = 2 / 7
ANSWER D
2007-10-13 19:59:34 · answer #7 · answered by Como 7 · 0⤊ 0⤋
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2016-10-21 23:44:32 · answer #8 · answered by Anonymous · 0⤊ 0⤋
ooo i've learnt that and its D.
probabilities are hard :(
good luck mate
2007-10-10 14:24:31 · answer #9 · answered by Desiree Mu 5 · 1⤊ 0⤋