My tooth in the back of my mouth on the top came out almost 5-6 months ago.

now there is a flap of skin its like my gums its hard to explain. My tooth is growing in, and there is a piece of my gum just hanging there its floppy, but the rest of my teeth are fine.

the hell is it? And I am so scared to go to the dentist, but I will if someone tells me what it is, or if it ever happened to them.

Suppose a dentist office keeps track of the number of new cavities discovered during a child's dental exam.

mean number of new cavities is 1.15 with a standard deviation of 0.35. The child's parents are charged $50 for the exam plus $20 for the treatment of each cavity.

total cost (exam plus treatment) for a child with X cavities is 50 20X.

is the mean and standard deviation of the total cost, 50 20X? A.

73 and standard deviation 57 B.

73 and standard deviation 7 C.

77.5 and standard deviation 57 D.

77.5 and standard deviation 7