Hey there! Sign in to join this conversationNew here? Join for free
x Turn on thread page Beta
    • Thread Starter

    I don't get normal distribution. I think it's partly down to me not fully understanding the difference between discrete and continuous distributions and my inability to make use of the area under the curve.

    Here's a typical question:
    The times taken for customers to pass through a supermarket check out have been found to be normally distributed with a mean of 6 minutes and a standard deviation of 4 minutes. What is the probability that a customer (randomly picked) will require:

    a) between 6-10 minutes
    b) more than 10 minutes
    c) less than 5 minutes
    d) between 5-10 minutes

    I start off okay by writing down the formula and plugging in the variables but I can't get the last couple of steps after reading off the tables. I don't think I make use of the bell shape curve either.

    Any help would be appreciated - exam coming up and all that.

    which bit is the bit you don't understand?
Have you ever experienced racism/sexism at uni?
Useful resources

Make your revision easier


Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here


How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

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