Answer:
1/a^2 is the answer to this question
Answer:
probability at least one zero is 0.3439
Step-by-step explanation:
given data
last four digits = randomly selected
to find out
probability that for one such phone number the last four digits include at least one 0.
solution
we know there are total 10 digit
so we first find probability of non zero digit i.e.
Probability ( non zero ) = 9 /10 = 0.9
and now we find probability of none of digit zero only event happen n= 4 time in a row by multiplication rules i.e
Probability ( none zero in 4 digit ) = 
Probability ( none zero in 4 digit ) = 
Probability ( none zero in 4 digit ) = 0.6561
so we can say probability at least one zero = 1 - Probability ( none zero in 4 digit )
probability at least one zero = 1 - 0.6561
probability at least one zero is 0.3439
Answer:
Don't accept A-G
Accept only A-E
Step-by-step explanation:
The company would those projects with a return of return equal to or higher than its cost of capital of 10.45%
Project A with a 12% return is acceptable.
Project B with a 11.5% rate of return is also acceptable
Project C has a rate of return of 11.2% , hence acceptable.
Project D has 11% rate of return and it is therefore acceptable.
Project E has 10.7% return rate and it is acceptable.
Project F has a lower rate of return of 10.3%, hence rejected, as well as projects G