The maximum value of a distribution is 47.5 and the minimum value is 4.0 us the range rule of thumb to estimate the standard deviation options  7.9 18.9 10.9 15.9

Use the Z-score formula given below Zscore=data - mean            standard deviation It has been determined that the mean task completion times for making fan belts at an auto parts manufacturing facility is 30 minutes. The times are normally distributed with a standard deviation of 2 minutes; a. What percent of belts will take less than 33 minutes to produce? b. What percent of fans will take more than 29 minutes to produce?

Asap plz handwritten solution acceptable  Will definitely upvote

Assume that adults have IQ scores that are normally distributed with a mean of 98.4 and a standard deviation 18.1. Find the first quartile Q₁, which is the IQ score separating the bottom 25% from the top 75%. (Hint: Draw a graph.) The first quartile is (Type an integer or decimal rounded to one decimal place as needed.) www

A normal distribution has a mean of 147 and a standard deviation of 4. Find the z-score for a data value of 133. Round to two decimal places

A normal distribution has a mean of 136 and a standard deviation of 10. Find the z-score for a data value of 141.Round to two decimal places

z Scores LeBron James, one of the most successful basketball players of all time, has a height of 6 feet 8 inches, or 203 cm. Based on statistics from Data Set 1 “Body Data” in Appendix B, his height converts to the z score of 4.07. How many standard deviations is his height above the mean?

​Claim: The standard deviation of pulse rates of adult males is less than 12 bpm. For a random sample of 153 adult​ males, the pulse rates have a standard deviation of 11.7 bpm. Find the value of the test statistic.