A study of college students stated that 25% of all college students have at least one tattoo. In a random sample of 80 college students, let x be the number of the students that have at least one tattoo. Find the mean and standard deviation for this binomial distribution.

The mean for this binomial distribution is 20 students.

The standard deviation for this binomial distribution is 3.873 students.

Step-by-step explanation:

We can model this random variable with a binomial distribution with parameters n=80 (sample size) and p=0.25 (probability of having at least one tatoo).

Let x be the number of students that have at least one tatoo, the mean and standard deviation of x can be calculated as:

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

it would open into a square depending on the type of envelope i’m not sure about the second part