Easy -1.8 This is a direct recall question requiring only knowledge that for a Poisson distribution, variance equals the mean, so standard deviation = √16 = 4. No calculation beyond a simple square root, no derivation, and it's multiple choice, making it significantly easier than average A-level questions.
1 The random variable $X$ has a Poisson distribution with mean 16
Find the standard deviation of $X$
Circle your answer.\\
4\\
8\\
16\\
256
\hfill \mbox{\textit{AQA Further Paper 3 Statistics 2024 Q1 [1]}}