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2 Statistics

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Question 296

A histogram has classes 0≤x<100\leq x<100≤x<10, 10≤x<25 10\leq x<25\,10≤x<25 and 25≤x<3025\leq x<3025≤x<30. The first two frequency densities are 1.2 and 0.8, and the total frequency is 30.

a.

Find the frequency density for 25≤x<3025\leq x<3025≤x<30.

[2]
b.

Find the probability that a randomly selected observation is at least 25.

[1]
Markscheme

2 Statistics Questions

  1. A Level
  2. /Maths
  3. /2 Statistics

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