Question

a statistics professor plans classes so carefully that the lengths of her classes are uniformly distributed between 49.0 and 59.0 minutes. Find the probability that a given class period runs between 50.5 and 51.25 minutes.

Answer 1

@Ottomaticc here is a question that i have. it says graph and find area of shaded region but I dont know what the vertical graph would be

Answer 2

the book gives an example and it says .5
so you subtract 50.5 from 51.25 and get .75, and then you multiply it by the vertical height to get the shaded area but it's not the right answer.

Answer 3

it says .075 it the answer.
and i divide .75 from .075 and get .1 but IDK where they get .1 from.

Answer 4

total length of time is ten minutes
from 50.5 to 51.25 is .75 minutes
the proportion of the time is \(\frac{.75}{10}=.075\)

Answer 5

yep what satellite said, just remembered as he put it up^

Answer 6

in other words it is the length of the favorable time divided by the total length.
that is all
height is silly because uniform means height is fixed, so ignore it

Answer 7

pick a point \(x\) at random on the interval \([0,2]\) what is the probability \(.9<x<1.2\) ?
it is \(\frac{.3}{2}\) that is all

Answer 8

oh okay i understand. because in the book, it doesn't divide. it multiplies lol and it doesnt used total length. thanks guys

Answer 9

i am sure it does in some way
you have to divide to get the probability

Answer 10

ooohhhhh i get it.

Answer 11

easy right?

Answer 12

for now.. lets see if the rest of the problems are just as simple!

Answer 13

haha the problems always get harder

Answer 14

Thank you @satellite73 this helps alot! started Stats 2 today, stats is my worst xD

Answer 15

yeah , good luck
as judge judy always says "the questions get harder"

Answer 16

yw

Answer 17

hey lets all study together on here lol

Answer 18

I can't this minute, I'm busy going over C3 math, but fan me, I will do stats with you next time :P

Answer 19

roger that!