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Because of the format of the table, I see this problem may include some "conditional probability." Familiar with that?
but I believe the answer is C, atleast what I got
How many people are 175 to 180 cm in height?
True, and how many are taller than 180 cm?
Yes, and how many are 175 cm tall or taller?
what does "or taller" mean?
you already asked me how many are 175 or taller and I answered 90
You were right. This new question is different from before.
How many people are between 175 cm and 300 cm tall?
I dont understand what youre asking
the graph stops at 180?
I know. I'm trying to get you to think.
IM SO CONFUSED
90 are 175 to 180 cm tall. 74 are above 180 cm. That could include people who are 230 cm. tall, right?
OK. Use this info to answer my question: how many people are 175 cm tall or taller?
add together 90 and 74. Does this help?
yes holy crap thank you, so 164?
yes. so, 164 people are 175 cm tall or taller. what does holy crap look like? ;)
so how do I figure out the answer
how many peoople are there all together?
what fraction of 250 peoople is 164 people?
would I just divide 250 by 164?
no, 164 by 250.;
now compare that result to the four given answers.
can you help me with one more?
Its using the SAME graph we just used
Right. I like to teach by asking questions so that you can discover answers for y ourself. Hope you didn't get too frustrated. sure, let's see the next problem
250 employees in an organization were surveyed about their hair color and height. The data collected is presented in the table. If a person taller than 180 cm is chosen at random what is the probability that the person has black hair?
& thats with the same graph we were already using
This is conditional probability. have you worked problems in conditional probability before?
I think I may have
OK. We are told that the person chosen is taller than 180 cm, right?
OK, now look at the table again. how many are taller than 180 cm?
right. now, that 74 is broken down into categories. Do you see one category labeledd "black hair?"
OK. We don't give a darn about anybody who's not over 180 cm tall. So, y ou concentrate on that group of tall people only. Forget the 250. You say, of 74, 29 have black hair?
yes so divide 29 by 74?
yes. and then compare your result to the possible answers.
I got 0.391 and the one answer is 0.392
Do I just round up?
Be sure you understand the reasoning here.
thank you so much for the help
of the people taller than 180 cm, how many do NOT have black hair?
I'll be quick, I promise.
last one LOL
Oh, really? what's the last qu?
Based on the data in this two-way table, what is the probability of a girl having above-average grades? 0.29 0.51 0.58 0.60
Gender/Grade Below Average Above Average Total Boy 14 23 37 Girl 16 22 38 Total 30 45 75
can you help me real quick?
this is also conditional probability. You are told that the person chosen at random is a girl. Forget aboput those boys; they don't count.
Now, how many girls are there?
or with above average grades
total number of GIRLS only.
Look at the table, really quick.
concentrating on girls ONLY, how many of the students have above average grades?
sTILL THERE? surely would appreciate having your full attention.