anonymous
  • anonymous
250 employees in an organization were surveyed about their hair color and height. The data collected is presented in the table. If a person is selected at random, what is the probability that the person is at least 175 centimeters tall? 0.296 0.344 0.360 0.656
Mathematics
  • Stacey Warren - Expert brainly.com
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
mathmale
  • mathmale
Because of the format of the table, I see this problem may include some "conditional probability." Familiar with that?
anonymous
  • anonymous
not really

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More answers

anonymous
  • anonymous
but I believe the answer is C, atleast what I got
mathmale
  • mathmale
How many people are 175 to 180 cm in height?
anonymous
  • anonymous
90
mathmale
  • mathmale
True, and how many are taller than 180 cm?
anonymous
  • anonymous
74
mathmale
  • mathmale
Yes, and how many are 175 cm tall or taller?
anonymous
  • anonymous
90?
mathmale
  • mathmale
No. Think.
mathmale
  • mathmale
what does "or taller" mean?
anonymous
  • anonymous
you already asked me how many are 175 or taller and I answered 90
mathmale
  • mathmale
You were right. This new question is different from before.
mathmale
  • mathmale
How many people are between 175 cm and 300 cm tall?
anonymous
  • anonymous
I dont understand what youre asking
anonymous
  • anonymous
the graph stops at 180?
mathmale
  • mathmale
I know. I'm trying to get you to think.
anonymous
  • anonymous
IM SO CONFUSED
mathmale
  • mathmale
90 are 175 to 180 cm tall. 74 are above 180 cm. That could include people who are 230 cm. tall, right?
mathmale
  • mathmale
OK. Use this info to answer my question: how many people are 175 cm tall or taller?
anonymous
  • anonymous
74?
mathmale
  • mathmale
add together 90 and 74. Does this help?
anonymous
  • anonymous
yes holy crap thank you, so 164?
mathmale
  • mathmale
yes. so, 164 people are 175 cm tall or taller. what does holy crap look like? ;)
anonymous
  • anonymous
so how do I figure out the answer
mathmale
  • mathmale
how many peoople are there all together?
anonymous
  • anonymous
250
mathmale
  • mathmale
what fraction of 250 peoople is 164 people?
anonymous
  • anonymous
would I just divide 250 by 164?
mathmale
  • mathmale
no, 164 by 250.;
anonymous
  • anonymous
0.656
mathmale
  • mathmale
now compare that result to the four given answers.
anonymous
  • anonymous
Its D
anonymous
  • anonymous
can you help me with one more?
anonymous
  • anonymous
Its using the SAME graph we just used
mathmale
  • mathmale
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
anonymous
  • anonymous
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?
anonymous
  • anonymous
& thats with the same graph we were already using
mathmale
  • mathmale
This is conditional probability. have you worked problems in conditional probability before?
anonymous
  • anonymous
I think I may have
mathmale
  • mathmale
OK. We are told that the person chosen is taller than 180 cm, right?
anonymous
  • anonymous
yes
mathmale
  • mathmale
OK, now look at the table again. how many are taller than 180 cm?
anonymous
  • anonymous
74
mathmale
  • mathmale
right. now, that 74 is broken down into categories. Do you see one category labeledd "black hair?"
anonymous
  • anonymous
yes 29
mathmale
  • mathmale
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?
anonymous
  • anonymous
yes so divide 29 by 74?
mathmale
  • mathmale
yes. and then compare your result to the possible answers.
anonymous
  • anonymous
I got 0.391 and the one answer is 0.392
anonymous
  • anonymous
Do I just round up?
mathmale
  • mathmale
close enuf.
mathmale
  • mathmale
Be sure you understand the reasoning here.
anonymous
  • anonymous
thank you so much for the help
anonymous
  • anonymous
hey
mathmale
  • mathmale
of the people taller than 180 cm, how many do NOT have black hair?
anonymous
  • anonymous
quick question
mathmale
  • mathmale
I'll be quick, I promise.
anonymous
  • anonymous
last one LOL
mathmale
  • mathmale
Oh, really? what's the last qu?
anonymous
  • anonymous
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
anonymous
  • anonymous
Gender/Grade Below Average Above Average Total Boy 14 23 37 Girl 16 22 38 Total 30 45 75
anonymous
  • anonymous
can you help me real quick?
mathmale
  • mathmale
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.
mathmale
  • mathmale
Now, how many girls are there?
anonymous
  • anonymous
in total?
anonymous
  • anonymous
or with above average grades
mathmale
  • mathmale
total number of GIRLS only.
mathmale
  • mathmale
Look at the table, really quick.
anonymous
  • anonymous
38
mathmale
  • mathmale
concentrating on girls ONLY, how many of the students have above average grades?
mathmale
  • mathmale
synskii?
mathmale
  • mathmale
sTILL THERE? surely would appreciate having your full attention.

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