Binomial probability with TI-84 binomcdf function

[battery88]

Homework Statement

If a fair die is tossed 7 times what is the probability of at least two 4s?

Homework Equations

The Attempt at a Solution

To solve this I used my TI-84's binomcdf function. I just want to see it I'm doing it correctly.
p(2<=x<=7) = 1 - p(0<=x<=1) = 1 - binomcdf(7,1/6,1) = 0.330

Thanks.

 

[Ray Vickson]

Homework Statement

If a fair die is tossed 7 times what is the probability of at least two 4s?

Homework Equations

The Attempt at a Solution

To solve this I used my TI-84's binomcdf function. I just want to see it I'm doing it correctly.
p(2<=x<=7) = 1 - p(0<=x<=1) = 1 - binomcdf(7,1/6,1) = 0.330

Thanks.

I don't have a TI-84, but if 'binomcdf' is what I think it is, your calculation is OK. Your answer is correct, too.

 

[battery88]

Great. Thanks!