On this math the average cost per once for glass cleaner is 7.7 cents with a standard deviation of 2.5 cent. what is the z-score of glass cleaner with a cost of 10.1 cents per ounce a: 0.96 b: 1.31 c: 1.94 d: 4.04 e: none of the above

This is geometry. could anyone ? i can't fail this class. my grade is quite low already.

Which sums are equal to 1hold 6/8? choose all answers that are correcta.1/8+6/8b.12/8+2/8c.8/8+1/8+1/8+1/8+1/8+1/8+1/8d.8/8+6/8

Monitors manufactured by tsi electronics have life spans that have a normal distribution with a standard deviation of 1800 hours and a mean life span of 20,000 hours. if a monitor is selected at random, find the probability that the life span of the monitor will be more than 17,659 hours. round your answer to four decimal places.