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Question 537

The waiting time in minutes, XXX, of a customer at a cafe is modelled by the probability density function

f(x)={kx(36−x2)0≤x≤60otherwise f(x) = \begin{cases} kx(36 - x^2) & 0 \le x \le 6 \\ 0 & \text{otherwise} \end{cases} f(x)={kx(36−x2)0​0≤x≤6otherwise​
a.

Show that k=1324k = \frac{1}{324}k=3241​.

[3]
b.

Using integration, find

the mean waiting time of a customer,

[3]
c.

the probability that a customer will wait for more than 4 minutes.

[2]
d.

Three independent customers visit the cafe.

Find the probability that at least 2 of the customers wait for more than 4 minutes.

[3]
Markscheme

Integration Questions

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

864 exam-style questions on Edexcel A Level Maths Integration, covering 11.1 Integrating Standard Functions, 11.2 Integrating f(ax + b), 11.3 Using Trigonometric Identities, 11.4 Reverse Chain Rule, 11.5 Integration by Substitution, 11.6 Integration by Parts, 11.7 Partial Fractions, 11.8 Finding Areas, 11.9 The Trapezium Rule, 11.10 Solving Differential Equations, and 11.11 Modelling with Differential Equations. Each one has a worked solution and a mark scheme showing where the marks go.

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