A Level Probability & Statistics 1 October November 2021 Paper 51 9709/51

A Level Probability & Statistics 1 October November 2021 Paper 51 9709/51

Timestamps:
0:00 Introduction
0:17 Question 1 (a)
2:24 Question 1 (b)
3:14 Question 2 (a)
5:37 Question 2 (b)
7:39 Question 3
11:58 Question 4 (a)
17:44 Question 4 (b)
19:52 Question 5 (a)
20:49 Question 5 (b)
23:54 Question 5 (c)
25:57 Question 5 (d)
29:16 Question 6 (a)
33:19 Question 6 (b)
36:01 Question 6 (c)
38:03 Question 6 (d)
39:09 Question 7 (a) (i)
42:57 Question 7 (a) (ii)
45:06 Question 7 (b)

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[Blister]

. The other past paper I did used the formula for variance by subtracting the mean squared.. can someone explain

[plasticide]

In 2.a, just literally substitute the values given. It was that easy, why complicate simple sums