u/Icy-Pound-3351

Please, upvote

Answers:

x = 8.89 var(x) = 0.461
Probability = 0.390
x = 6. 2)0.0357
0.473 2) 0.427 3) 0.058
1. x= 77 and x=23 2) a = 94
1. compare -1.428 with -1.645, and conclude "Do not reject H0. There is insufficient evidence at 5% SL to suggest that the mean value had decreased" ( Do not really remember the Z value that I got, but it was smth like -1.4..). 2) No, because the population was normally distributed. 3) n is greater or equal to 70
1)k= 1/3, 2) Median = (sqrt2) -1