The popping times of the kernels in a certain brand of microwave popcorn are normally distributed, with a mean of 150 seconds and a standard deviation of 13 seconds. the first kernel pops 128 seconds after the microwave oven is started. what is the z-score of this kernel?

answear:

a

step-by-step explanation: a

the equivalent expression are always the hardest ones but you look at the gcf also

step-by-step explanation:

13

step-by-step explanation:

divide the cost of the total of sodas you bought by the cost of one soda, for example:

$24.57 divided by $1.89 is 13 which means you bought 13 sodas

answer: 7 x 2/5 = 2.8 hours, is your answer. your welcome! : 3

step-by-step explanation: first work out how long it took to hose 1/7 of the lawn which is 2/5 hours. times that by 7 to get the whole lawn.

sorry i don't know the other answer. i didn't learn what a proportional relationship is.