A retired 68-year-old banker comes to your clinic for evaluation of left shoulder pain. He swims for 30 minutes daily, early in the morning. He notes a shoulder pain at night and “catching” when he raises his left arm.  On physical examination, you note weakness of the left shoulder muscles. The drop arm test is positive. Based on this description, what is the most likely cause of his shoulder pain?

Forest fires are a concern to many and are thus worth analyzing. The number of acres burned in a large U.S. region follows a normal distribution with a mean of 4,000 acres per year and a standard deviation of 700 acres.        a)  Find the probability that more than 4,200 acres will be burned in a year by forest fires.  You must type your work shown into the provided text box.       b)  Find the probability that between 4,100 acres and 4,500 acres will be burned in a year by forest fires.  You must type your work shown into the provided text box.

Steel rods are manufactured with a mean length of 25 cm.  Because of variability in the manufacturing process the lengths of the rods are approximately normally distributed with a standard deviation of 0.07 cm.  How many steel rods are manufactured in total if 6,000 of them have a length less than 24.9 cm or greater than 25.1 cm?  You must type your work shown into the provided text box.

  A client reads a block from HDFS. Which node actually sends the block data?

Which HBase component serves regions?

An RDD has 150 partitions. Your cluster has 25 CPU cores. Ignoring scheduling overhead, how many tasks execute simultaneously?

Which operation generally causes a page fault?

Which type represents a Decision Tree before training?

 HBase data is organized primarily by

 Which system is best suited for large-scale analytics over structured data?