AS & A Level Mathematics (9709) — May–June 2023, Paper 62
7 questions · every question answerable online with instant point-by-point AI marking against the official mark scheme.
Start with Question 1 →In a survey of 200 randomly chosen students from a certain college, 23% of the students said that they owned a car. Calculate an approximate 93% confidence interval for the…
Answer this question and get it marked →The random variable W has a Poisson distribution. State the relationship between E(W) and Var(W).
Answer this question and get it marked →The masses, in kilograms, of newborn babies in country A are represented by the random variable X, with mean μ and variance σ². The masses of a random sample of 500 newborn babies…
Answer this question and get it marked →The number, X, of books received at a charity shop has a constant mean of 5.1 per day. State, in context, one condition for X to be modelled by a Poisson distribution.
Answer this question and get it marked →Two random variables X and Y have the independent distributions N(7, 3) and N(6, 2) respectively. A random value of each variable is taken. Find the probability that the two…
Answer this question and get it marked →When a child completes an online exercise called a Mathlit, they might be awarded a medal. The publishers claim that the probability that a randomly chosen child who completes a…
Answer this question and get it marked →The diagram shows the graph of the probability density function, f, of a random variable X which takes values between 0 and 4 only. Between these two values the graph is a…
Answer this question and get it marked →