A space agency monitors the deployment of a large constellation of n n\,n small satellites. The number of satellites, SSS, that successfully reach their intended altitude in a single deployment phase is modeled by the discrete random variable S∼B(n,p)S \sim \text{B}(n, p)S∼B(n,p). The mean number of successful deployments is 80.
State the variance of S S\,S in terms of ppp.
A normal distribution is used as an approximation for SSS. Using this approximation and a continuity correction, it is found that P(S≥92)=0.0301P(S \ge 92) = 0.0301P(S≥92)=0.0301 to 3 significant figures.
Show that 80−80p=6.117\sqrt{80 - 80p} = 6.11780−80p=6.117 to 4 significant figures.
Hence find the value of ppp, giving your answer to 2 significant figures.
67 exam-style questions on OCR A Level Maths 2.4.4 Mean and variance of the binomial (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.