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Paper 3 · Statistics
4.2 Statistical distributions
Question 1 · 5 marks
Calculator allowed
Spec and skills
Paper scope: Paper 3 Statistics
Spec S4.2
Original practice question
The random variable
X
∼
N
(
120
,
15
2
)
X \sim \text{N}(120, 15^2)
X
∼
N
(
120
,
1
5
2
)
.
(a)
Find
P
(
X
<
140
)
P(X < 140)
P
(
X
<
140
)
.
2 marks