Cho bảng phân phối xác suất của biến ngẫu nhiên hai chiều (X, Y) như sau: Y X 1 2 3
0 m 0,3 0.05
1 0,2 0,15 0,1

1/ Tìm m ?
2/ Tính P( X+Y=1)=?
3/ Tìm E (X) = ?

Ben frank is an electrician who installs lighting fixtures. he charges (in dollars) his clients 15h+40f15h+40f where hh is the number of hours worked and ff is the number of fixtures installed. how much does ben frank charge when he works 77 hours and installs 99 fixtures?

Given a normal distribution with µ =50 and σ =4, what is the probability that 5% of the values are less than what x values? between what two x values (symmetrically distributed around the mean) are 95 % of the values? instructions: show all your work as to how you have reached your answer. don’t simply state the results. show graphs where necessary.

Allen wants to buy a hover board that sells for $249.99 and a helmet that is $36.54. how much change will allen receive if he gives the cashier three $100.00 bills?