ture.com 1 pts D Question 3 Consider Section 5.1.4 Homework Problem 1. The table given is a probability mass/distribution table for the number of days to fix defective glasses. What do the probabilities add to? D Question 4 3 pts Consider Section 5.1.4 Homework Problem 1. What is the standard deviation of the number of days to fix defects? Do not round at all and report your answer as a decimal rounded to 3 decimal places. Hint: Instead of using the definitional formula for variance and then finding the standard deviation, you can use the computational formula below: V ( X) - E ( X ) - (E ( X)) You can find E(X) using the normal method. That's in the second bit, and you'll have to square it. E(X2) may be less familiar. To compute it, you can square all of the numbers of days to fix the defect in the table (so, 1, 4, 9, and so on) and find the mean/expected value of those numbers with the same probabilities. Then, do the subtraction above. Or, use the other formula. or RStudio