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Link to the paper:
http://www.mathsexams.ukteachers.com/Edexcel/S1_2004_Nov.pdf
3(b)
From statistical tables
(1.800) = 1 - 0.0359
(1.200) = 1 - 0.1151
So
66 = - 1.800
81 = + 1.200
Solve these simultaneous equations to find and .
6(e)
It follows from
P(X < + a) = 0.975
(1.960) = 0.975
that a = 1.960.
http://www.mathsexams.ukteachers.com/Edexcel/S1_2004_Nov.pdf
3(b)
From statistical tables
(1.800) = 1 - 0.0359
(1.200) = 1 - 0.1151
So
66 = - 1.800
81 = + 1.200
Solve these simultaneous equations to find and .
6(e)
It follows from
P(X < + a) = 0.975
(1.960) = 0.975
that a = 1.960.
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