Question

78. During lunch at Urbana Middle School today, several students have brought their lunch from home and several students are ordering a school lunch as shown in the table. Suppose one student is randomly selected during lunch time. What is the probability that the student orders school lunch?
Brought lunch from home 55
Order school lunch 45
6th graders 32
7th graders 35
8th graders 33

Answer 1

45/100

Answer 2

is the number of students in 6th ,7th and 8th included in the experiment ?

Answer 3

yes they are included

Answer 4

further reduced to 9/20

Answer 5

then the probability is 45/185

Answer 6

how did you get the answer

Answer 7

oops! sorry calculation mistake:total number of peopl in the experiment is 55+45+32+35+33=200 and hence it is 45/200

Answer 8

brackett, the question means to say of the 6th 7th and 8th graders, 45 order school lunch and 55 bring their own. So it's 45/100

Answer 9

the total students are 100 -- 55 + 45

then the breakup of 100 per standard is given (their total is also 100)
this breakup is of no use here

Answer 10

@lucas:yea thats makes sense though :)

Answer 11

the way the question is written is confusing.

Answer 12

i didnt write it my teacher did

Answer 13

Hey 3077097a, pls click my GOOD ANSWER button :))

Answer 14

the number of students in each grade is superfluous! Perhaps its there to confuse!! lol

Answer 15

maybe i dont know

Answer 16

thanks anyways

Answer 17

45/100 chance is the same as 45% chance so you can just say that.