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4.2.2 Statistical distributions (A-level only)

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In a histogram, what represents the frequency of a class?

A

A single value has probability zero, so P(X<a)=P(X≤a)P(X<a)=P(X\le a)P(X<a)=P(X≤a).

B

The area of its bar.

C

P(Y>k+0.5)P(Y>k+0.5)P(Y>k+0.5).

D

If X∼B(n,p)X\sim B(n,p)X∼B(n,p), its matching Normal approximation has mean npnpnp and variance np(1−p)\boxed{np(1-p)}np(1−p)​.

Card 1 of 24

4.2.2 Statistical distributions (A-level only) Flashcards

  1. A Level
  2. /Maths
  3. /4.2.2 Statistical distributions (A-level only)

24 flashcards on WJEC A Level Maths 4.2.2 Statistical distributions (A-level only): the key formulae, methods and definitions you need to recall for AS Unit 1, AS Unit 2, A2 Unit 3 and A2 Unit 4.

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