Edexcel Level 3 GCE
8FM0/23
Further Mathematics
Advanced Subsidiary Further Mathematics options 23: Further
Statistics 1
(Part of options B, E, F and G)
May 2023
, 1. The discrete random variable X has the following distribution
AREA
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x 0 1 2 3 4
k k k
P(X = x) r k
2 3 4
where r and k are positive constants.
The standard deviation of X equals the mean of X
Find the exact value of r
(6)
AREA
DO NOT WRITE IN THIS
AREA
DO NOT WRITE IN THIS
2
8FM0/23
Further Mathematics
Advanced Subsidiary Further Mathematics options 23: Further
Statistics 1
(Part of options B, E, F and G)
May 2023
, 1. The discrete random variable X has the following distribution
AREA
DO NOT WRITE IN THIS
x 0 1 2 3 4
k k k
P(X = x) r k
2 3 4
where r and k are positive constants.
The standard deviation of X equals the mean of X
Find the exact value of r
(6)
AREA
DO NOT WRITE IN THIS
AREA
DO NOT WRITE IN THIS
2
