statistics

posted by .

A history class has 75 members. If there is a 12% absentee rate per class meeting, find the mean, variance, and atandard deviation of the number of students who will be absent from each class

• statistics -

Mean = np = (75)(.12) = ?

Variance = npq = (75)(.12)(.88) = ?
(Note: q = 1 - p)

Standard deviation = square root of the variance

I'll let you finish the calculations.

• statistics -

Mean=9
Variance=792
Standard Deviation=28.14

• statistics -

for the standard deviation, I do not get that answer.

• statistics -

Variance is supposed to be 7.92

Similar Questions

1. Stats

a teacher teaches two sections (A and B) of a class. Both sections have a mean score of 75. Section A only has 5 students and they all received a score of 75, while section B has 15 students with a mean score of 75 with a variance …
2. stats

A club has 50 members. If there is a 10% absentee rate per meeting, find mean and standard deviation: How do you do the problem step by step
3. Statistics

The heights of the students in a statistics class are approximately normal with mean 68 inches and a standard deviation of 2.75 inches. Suppose that the heights of the 15 male students in the statistics class are also approximately …
4. Maths

A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution …
5. Statistics

A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution …

Suppose that each student in stat. has a 9% chance of missing class on any given day and that student attendance is independent. In a stat. class of 20 students, find the probability that: 1) no student is absent =15.16 2) one student …
7. statistics

The mean grade in this class last semester was 78.3, and the variance was 34.6 . The distribution of grades was unimodal and symmetrical.. determine how many students are likely to fail the class (<60), and how many students are …
8. statistics

An instructor in a large lecture class found at the end of the semester that total points scored by students in his class was approximately Normal with mean 530 and standard deviation 80. If 10% of the class are to receive A's (he …
9. Statistics

80. Florida State University has 14 statistics classes scheduled for its Summer 2013 term. One class has space available for 30 students, eight classes have space for 60 students, one class has space for 70 students, and four classes …
10. MATHMATHICS

Aschool community had planned to reduce the number of agrade 10 students per class room by constructing additional class room. however,they constructed 4 less rooms than they planned.as aresult,the number of students per class was …

More Similar Questions