The Student Room Group
Uni students - Complete our survey >>
Uni students - Complete our survey >>
Uni students - Complete our survey >>

Binomial distribution and normal approximation -are my answers correct ?

Screenshot (111).pngScreenshot (112).pngScreenshot (113).png
Are the answers to these questions c e & c respectively ?
also, my working for the 2nd question is in the pic, is it correct ?
(edited 4 years ago)
Reply 1
Avatar for mqb2766
mqb2766
21
Original post by JanaALEVEL
Screenshot (111).pngScreenshot (112).pngScreenshot (113).png
Are the answers to these questions c a & c respectively ?
also, my working for the 2nd question is in the pic, is it correct ?

Can't read the first question.
Will check the 2nd in the morning
Can you show how you came up with c) for the 3rd?
(edited 4 years ago)
Reply 2
Avatar for simon0
simon0
13
If it helps, for:

- Question 5, I obtain answer c (0.4562),

- Question 6, I obtain answer e (0.316),

- Question 17, I obtain answer c (0.703).

Does this help?
Reply 3
Avatar for JanaALEVEL
JanaALEVEL
OP
10
Original post by simon0
If it helps, for:

- Question 5, I obtain answer c (0.4562),

- Question 6, I obtain answer e (0.316),

- Question 17, I obtain answer c (0.703).

Does this help?

ah yes I meant e for 6
Thanksss
Reply 4
Avatar for JanaALEVEL
JanaALEVEL
OP
10
Original post by mqb2766
Can't read the first question.
Will check the 2nd in the morning
Can you show how you came up with c) for the 3rd?

I calculated the prob of getting 0,1,2, and 3 balls then I did 1- ans

(for 0 white balls its 7/10 to the power of 15
for 2 its 3/10 squared * 7/10 ^13 *15C2 etc

and I added all the prob)
Reply 5
Avatar for mqb2766
mqb2766
21
Original post by JanaALEVEL
I calculated the prob of getting 0,1,2, and 3 balls then I did 1- ans

(for 0 white balls its 7/10 to the power of 15
for 2 its 3/10 squared * 7/10 ^13 *15C2 etc

and I added all the prob)


I thought they wanted you to use the normal approximation?
Reply 6
Avatar for JanaALEVEL
JanaALEVEL
OP
10
Original post by mqb2766
I thought they wanted you to use the normal approximation?

Oh
The 1st 2 questions yes
But the exam is a stats exam not a normal approximation test so I can use whatever I want. I just titled it binomial distribution and normal approximation because of the 1st two questions
Reply 7
Avatar for mqb2766
mqb2766
21
Original post by JanaALEVEL
Oh
The 1st 2 questions yes
But the exam is a stats exam not a normal approximation test so I can use whatever I want. I just titled it binomial distribution and normal approximation because of the 1st two questions

OK :-)

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you