using a relative frequency table, you can add the values in the first row of the table and divide by the number of columns in the table [TruefFalse)____. ll Study Yakir (2011) pp. ELSE} and solved problems 41.6-41.8. The (population) standard deviation of the random variable above is [round to 3 decimal places):__ _ (hint, you can not put values from the table into the sd() function because the sd() function does not adjust for the probabilities). 18.99 If you have already calculated the standard deviation of a data sample, what is the next thing to do to find the variance: ______ ___________ A Population: 19.@ Determine how many observations in the pop3.csv file are of type a: _____ . 20. Using the appropriate R function with the defaul options, what is the median of the time column of pop3 {round to 3 decimal places]: __________ ______ . 21. What is the variance of the time column of pop3 [rounded to three decimal places)