Suppose that 30% of all students who have to buy a text for a particular course want a newcopy (the successes), whereas the other 70% want a used copy. Consider randomly selecting 25purchasers.(a)[3 pts]Find the mean and standard deviation of the number of students who want a newcopy of the book.

Find the gradient of f(x,y,z)equals=left parenthesis x squared plus y squared plus z squared right parenthesis superscript negative 1 divided by 2 baseline plus ln left parenthesis x right parenthesis x2+y2+z2−1/2+ln(xyz) at the point left parenthesis negative 2 comma 1 comma negative 2 right parenthesis(−2,1,−2).

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Hii1977 cleaner shrimp are a species of shrimp that clean parasites from other organisms. fish allow the shrimp to eat the parasites in their mouth. the shrimp get a source of nutrition. the relationship between the shrimp and the fish is this association indicates that for the smaill aneser arecommensal,mutualistic,or parasitic for the begger one the anser are the shrimp and fish benefit each other , the shrimp harm the fish, or the fish do not benetit from the shrimp