A group of friends compares what they received while trick or treating. They find that the average number of pieces of candy received is 43, with standard deviation of 2. What is the z-score corresponding to 20 pieces of candy?

Q6. The Floppy Disk Company makes 3.5 inch floppy disks for disk drives that are 3.7 inches wide. The width of a manufactures disk is normally distributed with a standard deviation of 0.1 inches. The company manufactures 1000 disks every hour.

1. 35% of the disks’ width were less than how many inches?
2. 55% of the disks’ width were less than how many inches?
3. In one hour, how many disks would you expect between 3.45 inches and 3.55 inches?
4. The middle 40% of floppy disks are between which two widths