May June 2018 Statistics and Probability 72 (A2)

[FaZe_Firaas_]

Guys & Girls how was the exam???
Mine was good
If you remember any questions then comment it below
And what do u guys think the threshold is gonna be....

 

[Tauqir_hamed]

here are some of my answers for paper 72
1 ) i ) 0.359
2) A follows Normal ( 6 , 4.8 ) , B follows normal ( 6 , 2.4 )
3) confidence interval = 48.7 , 55.3
ii ) width would be less
4) u = 496 , Var = 12. sth
ii) z value came out be sth like -2.04
the null hypothesis wasn't rejected

5) b = 2/a
a = 1.5
6) a ) accidents occur randomly, independently
b ) 0.134
c ) 0.158
d ) 0.952
7) a ) 1- P ( X <=3 ) , came out to be sth like 0.05... ., which is less than 1 % . so null hypothesis not rejected
b ) P ( Type II error ) = 0.254