Question

magine taking a 10 question true or false exam. You randomly guess at each question. Don’t do any calculations, just tell me your gut sense.

a) Is this a binomial setting?
b) How many questions do you think you will get correct?
c) How surprised would you be if you passed (6 out of 10 correct or better) the exam?
d) How surprised would you be if you got an ‘A’ on the exam (9 or 10 out of 10)?

Answer 1

for part a,
the events are equally likely and independent so its a binomial setting

Answer 2

for part b,
should be easy for u to figure out

Answer 3

wat do u think ?

Answer 4

Looks good to me.

Answer 5

for C and D how would i do those?

Answer 6

depends on what u think for part b

Answer 7

B would be the probability of getting on question correct

Answer 8

b) How many questions do you think you will get correct?

Answer 9

i went with 1 out 10. but you can get any amount from 1-10

Answer 10

it can be any amount between 0-10 actually

Answer 11

u can get all questions wrong also, right ?

Answer 12

yes you can.

Answer 13

well, but that happens only on ur greatest unluckiest rarest day

Answer 14

thats very unlikely to happen in general

Answer 15

since you have 10 questions,
and each question can be either TRUE or FALSE,
you have 50-50 chances for correctly ticking each question

Answer 16

yeah i was thinking 10 question only true false you must get at least one correct that's why i did not think of the 0 getting all wrong

Answer 17

so you should expect getting ~5 questions Correct actually

Answer 18

getting only 0 or 1 questions correct is very UNLIKELY

Answer 19

so is getting 9 or 10 correct

Answer 20

if that makes any sense...

Answer 21

it does . all about your luck ever take this kind of exam

Answer 22

:) so whats ur answers for b, c, d ?

Answer 23

B) 5 out of 10
C) I would not be so surprised because that around how much i expecting to get correct.
D) I would very surprised because it's not really likely for someone to do good on an exam like that

Answer 24

Looks very good !!

Answer 25

thanks for the help

Answer 26

np :)

Answer 27

can you help me with this one too.
Draw a single a card from a standard deck of cards. Observe the card and then replace it. Count the number of times you draw a card like this until you get a seven

Answer 28

probability of drawing one card from a deck 1 out of 52. The Count the number of times you draw a card like this until you get a seven i dont understand

Answer 29

@ganeshie8

Answer 30

I think it is asking u to count how many cards u need to observe until u get a 7

Answer 31

there are a total of 52 cards

Answer 32

How many cards are "7" ?

Answer 33

there will be FOUR cards with "7" right ?

Answer 34

right

Answer 35

so the probability of getting a 7 is : 4/52

Answer 36

which is same as 1/13

Answer 37

so you need to draw around "13" cards to get the number 7 card

Answer 38

okay

Answer 39

thats it, we're done.

Answer 40

I thought it would be more complicated that that

Answer 41

hmm