The scores on a college entrance exam have an approximate normal distribution with mean, =61 points and a standard deviation, =10 points.

Enter the exact answers in increasing order.

(a) About68% of the y values lie between _____ and _______.The z-scores are _____ and ____, respectively.

(b)About 95% of the y values lie between _____and_____ .The z-scores are____ and____ , respectively.

(c) About 99.7% of the y values lie between _____ and_____ .The z-scores are____ and_____ , respectively.