Turn on thread page Beta
    • Thread Starter
    Offline

    10
    ReputationRep:
    http://www.ocr.org.uk/Images/61423-q...nced-level.pdf

    question 12 III , ty.
    Offline

    3
    ReputationRep:
    Wow! I didnt' even know you could attach whole files here. But may you're looking for something like http://goo.gl/RHXaS5 They help me out with some stuff too.
    Offline

    7
    ReputationRep:
    Hi. Don't know if you've done this question yet? (the link in the post above mine didn't help, lol)

    For each part, work out the probability using the ratio and proportions given, use n=8 and then a random variable with the appropriate binomial distribution.
    Spoiler:
    Show
    (i) p(male)=9/20; X ~ B(8, 9/20).
    Work out P(X=8)

    (ii) p(female)=11/20; X ~ B(8, 11/20)
    Work out P(X=5)

    (iii) p(part time)
    =( (9/3)+(11/2) ) / 20
    =17/40; X ~ B(8, 17/40)
    Work out P(X >= 2)
 
 
 

University open days

  1. University of Bradford
    University-wide Postgraduate
    Wed, 25 Jul '18
  2. University of Buckingham
    Psychology Taster Tutorial Undergraduate
    Wed, 25 Jul '18
  3. Bournemouth University
    Clearing Campus Visit Undergraduate
    Wed, 1 Aug '18
Poll
How are you feeling in the run-up to Results Day 2018?

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.