(Solved): (a) Calculate the z-score of a song that lasts 225 seconds. (Round your answer to two decimal place ...

(a) Calculate the $z$-score of a song that lasts 225 seconds. (Round your answer to two decimal places.) (b) Interpret the $z$-score of the song that lasts 225 seconds. (Let $z=?z$-score $?$ from part (a).) The song's length is $z$ standard deviations above the mean. The song's length is $z$ standard deviations above the median. The song's length is $z$ seconds longer than the mean. The song's length is $z$ seconds longer than the median. [-/1 Points] standard deviation of 13,000 hours. Let $x=$ the life expectancy (in hours) of a new LED lightbulb. (a) What is the $z$-score for a new LED lightbulb that lasts 247,000 hours? $\%$ (c) $P(260,000<x<286,000)$ (Use the Empirical Rule. Write your answer as a percent.) $\%$