Which of these fractions are greater than 11/20

A - 3/4
B - 3/10
C - 4/5
D - 1/2

Rockwell hardness of pins of a certain type is known to have a mean value of 50 and a standard deviation of 1.1. (round your answers to four decimal places.) (a) if the distribution is normal, what is the probability that the sample mean hardness for a random sample of 8 pins is at least 51?

Valentina is subtracting from . she finds the lcd to be 15y2. what is valentina's next step?

Acomputer store bought a program at a cost of $10 and sold it for $13. find the percent markup