# Math problem

#1

I should know how to do this, but I get confused every time. This is Statistics by the way.

Basically, you are trying to get in contact with somebody in California. 68% of the houses have unlisted number. You sample 150 households.
What is the probability that between 50 and 65 (including 50 and 65) households have listed numbers?

#2

im in 8th grad and havnâ€™t done statistics yet, buuuuut if i did it right then itâ€™s 68%. hope it works ;D

(JayVee) #3

I think that itâ€™s 0%. If 68% have an unlisted number, then that means 32% of them have a listed number. Multiply that to 150, then you get 48, which is less than 50.

Thatâ€™s my guess, but donâ€™t take my word for it. This is beyond my mathematical abilities

#4

oops, i got the unlisted houses
ok, this is how i did it

65-50=15 cause thatâ€™s the only #'s that matter

100%-68%=32%

15x 32%=4.8

4.8/15= .32% chance of a listed house.

And P.S. what grade is this?

#5

But there are 16 houses.
House 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 90, 61, 62, 63, 64, 65.

#6

Yeah, ijuggleyoyos. No offense but you have absolutely no idea what youâ€™re doing.

Catorameus has gotten the closest but I donâ€™t think heâ€™s right.

EDIT: Messed around a bit with the numbers and I think I got it right. 0.3960 Anyone else got this?

#7

ya, i donâ€™t. but i solved it the most logical way to me

(JM) #8

Looking at the numbers, that answer is logical and definitely within the ballpark.

(Marvin.D) #9

i have problem for yall

7 girls get on a bus,each girl has 7 kittens in her bookbag,and ever kitten,has 1 mother cat. how many legs are there in all?

(Runez4lyf) #10

I think it is 406 legsâ€¦
14 individual cats in a bag times 4 because they have 4 legs.
(56)
Times 7 for seven kids.
(392)
Plus 14 because of each girlâ€™s legsâ€¦
(406)

There you go!

(Marvin.D) #11

nope think again

(Raphael) #12

who keeps a kitten in a bookbag? and the Is the mother cat with the kittens?

#13

Too many. Lol.

Itâ€™s 14x7=98 kittens x 4 legs per=392+7girlsx2 legs per=392+14=406â€¦how is that not right?

Way to hijack my thread by the way.

EDIT: Got another one. I got an answer but I donâ€™t know if I did it right.
Basically: A construction worker pulls a 16 ft plank up the side of a building with a rope. He pulls it up at .5ft/s, and the bottom end up the plank follows a path perpendicular to the building. How fast is the end of the plank sliding along the ground when it is 8 ft from the wall of the building?
http://img10.imageshack.us/img10/1230/88618576.png
Thatâ€™s more or less the image it gives. I got .87 ft./sec but I donâ€™t know if thatâ€™s right.

(Raphael) #14

You forgot the driver :

what you did seems right though 10 10010 1001 1 1110 (Brian is so much easier)

#15

Oh facepalm That was pretty good.

I think weâ€™re going over the homework anyways so Iâ€™ll be fine.

(Marvin.D) #16

each cat has one mother cant now do the math

(Jesse) #17

Wait, isnâ€™t it 138 legs?

#18

98 kittens and/or cats. Whatever. The answer is 408 because of the driver of the bus.

Whereâ€™d 138 come from?

(Jesse) #19

Nevermind, I did the mother cat part wrong, itâ€™s 406. They never said there was a driver, theyâ€™re just randomly getting onto a bus. If there was a driver, he or she would have been mentioned in the riddle, plus, it would be 410 because we all know bus drivers walk on all fours.

#20

Lol. But thatâ€™s the part of many riddles.

You are driving a bus with 18 people on it. If 18 people get off, who is left?

Kind of the same idea.