Other sites have listed the answer as: Using the z-table, 90%, .9000, corresponds to a z-value of 1.28167 X – 180 ———- = 1.28166666… 6 Solving for X X-180 = 7.69 X = 187.69 So 10% of the puppies will have an average heart rate of more than 187.69 bpm. I am confused on the 7.69 part. How do I know or find out that x-180=7.69? Where am getting this answer from?

Other sites have listed the answer as: Using the z-table, 90%, .9000, corresponds to a z-value of 1.28167 X – 180 ———- = 1.28166666… 6 Solving for X X-180 = 7.69 X = 187.69 So 10% of the puppies will have an average heart rate of more than 187.69 bpm. I am confused on the 7.69 part. How do I know or find out that x-180=7.69? Where am getting this answer from?

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