Before 1918, approximately 55% of the wolves in a region were male, and 45% were female. However, cattle ranchers in this area have made a determined

[Mswaray]

Before 1918, approximately 55% of the wolves in a region were male, and 45% were female. However, cattle ranchers in this area have made a determined effort to exterminate wolves. From 1918 to the present, approximately 70% of wolves in the region are male, and 30% are female. Biologists suspect that male wolves are more likely than females to return to an area where the population has been greatly reduced. (Round your answers to three decimal places.)
a) Before 1918, in a random sample of 10 wolves spotted in the region, what is the probability that 7 or more were male?


What is the probability that 7 or more were female?


What is the probability that fewer than 4 were female?


(b) For the period from 1918 to the present, in a random sample of 10 wolves spotted in the region, what is the probability that 7 or more were male

What is the probability that 7 or more were female?


What is the probability that fewer than 4 were female?

 

[Dr.Peterson]

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[Mswaray]

I did 1) n=10 r=7 p=0.70 q=0.30
7 8 9 10
n=10, r= 7 p=0.30 ,q=0.70
7 8 9 10
n= 10 ,r =4 ,p=0.70 ,q=0.30
4 5 6 7 8 9 10 that's how far am and that's where I'm stuck at

 

[Dr.Peterson]

Before 1918, approximately 55% of the wolves in a region were male, and 45% were female. However, cattle ranchers in this area have made a determined effort to exterminate wolves. From 1918 to the present, approximately 70% of wolves in the region are male, and 30% are female. Biologists suspect that male wolves are more likely than females to return to an area where the population has been greatly reduced. (Round your answers to three decimal places.)
a) Before 1918, in a random sample of 10 wolves spotted in the region, what is the probability that 7 or more were male?
What is the probability that 7 or more were female?
What is the probability that fewer than 4 were female?

(b) For the period from 1918 to the present, in a random sample of 10 wolves spotted in the region, what is the probability that 7 or more were male
What is the probability that 7 or more were female?
What is the probability that fewer than 4 were female?

I did 1) n=10 r=7 p=0.70 q=0.30
7 8 9 10
n=10, r= 7 p=0.30 ,q=0.70
7 8 9 10
n= 10 ,r =4 ,p=0.70 ,q=0.30
4 5 6 7 8 9 10 that's how far am and that's where I'm stuck at

In part (a), you need to use the before-1918 data, so p=0.55. And if fewer than 4 were female, the number of males is not 4 or more, as you list, but 7 or more. (That is, the number of females is 0, 1, 2, or 3.)

But are you saying that you didn't try putting your numbers into the formula? What prevented you from going further?