More Lessons for A Level Maths
Examples, videos, solutions, activitie,s and worksheets that are suitable for A Level Maths.
A-level Statistics: Normal Distribution, P(X less than x)
We show you through an example how to work out probabilities from a normal distribution.
A battery has a lifetime which is normally distributed with a mean of 62 hours and a standard deviation of 3 hours.
What is the probability of a battery lasting less than 68 hours?
A-level Statistics: Normal Distribution, P(X more than x)
The masses of a well known brand of breakfast cereal are normally distributed with mean of 250g and standard deviation of 4g. Find the probability of a packet containing more than 254.4g.
Normal Distribution: P(more than x) where x is less than the mean
In this tutorial we show you how to calculate the probability given that x is less than the mean from a normal distribution by looking at the following example.
A carton of orange juice has a volume which is normally distributed with a mean of 120ml and a standard deviation of 1.8ml. Find the probability that the volume is more than 118ml.
Try the free Mathway calculator and
problem solver below to practice various math topics. Try the given examples, or type in your own
problem and check your answer with the step-by-step explanations.
We welcome your feedback, comments and questions about this site or page. Please submit your feedback or enquiries via our Feedback page.