Z- score multiple choice practice assignment

1. Mr. Green Fatigues is in the 85th percentile in his class with respect to grades. This means,

• 85% of the class is smarter than him.
• He is smarter than 85% of the class.
• He has an 85% average.
• The class average is 85%

2. Suppose a random variable has a z-score of -1.75, a standard deviation of 8 and X = 12. Then the mean of X is,

• -26
• 6
• -6
• 26

1. Suppose the masses of Megalodons are normally distributed with a mean of 47,000 kg and a standard deviation of 2,500 kg. Approximately how many, in a group of 175 megalodons, have a mass of more than 51,375 kg?

• 0.9599
• 168
• 167.98
• None of the above.