a group of 625 students has a mean age of 15.8 years with a standard deviation of 1.2 years. the ages are normally distributed. about how many students in this sample are younger than 17?

Late at night some traffic signals change patterns and become ?

What kinds of antigens are found on the rbcs of a person with a+ blood

The ancestors of horses possessed feet with five digits. over time, with the development of grasslands, the digits fused and formed hooves. what evolutionary advantage did this transformation serve? a. it allowed them to climb rocky surfaces with ease. b. it allowed them to graze better. c. it enabled them to run faster from predators. d. it let them see clearly through the grasslands. e. it made them taller.