SIRUMENTS andoly selected Calculate the standard error of the mean. What is the probability that the sample mean will be less than $7.75? What is the probability that the sample mean will be less than $8.10? What is the probability that the sample mean will be more than $8.20? a. b. c. d. 30 2. The weight of NFL players has increased steadily, gaining up to 1.5 lbs. per year since 1942. According to ESPN, the average weight of a National Football League (NFL) player is now 252.8 Ibs. Assume the population standard deviation is 25 lbs. A random sample of 38 NFL players are selected. a. Calculate the standard error of the mean. b. What is the probability that the sample mean will be less than 246 lbs.? c. What is the probability that the sample mean will be more than 249 lbs.? d. What is the probability that the sample mean will be between 254 and 258 Ibs.? e. Identify the symmetrical interval that includes 95% of the sample means if the true population mean is 252.8 lbs. On Campus Research recently reported that 46% of college students aged 18-24 would spend their spring breaks relaxing at home. A sample of 155 college students was selected 3, Calculate the standard error of the proportion. what is the probability that less than 40% of the college students from the sample spent their spring breaks relaxing at home? what is the probability that more than 50% of the college students from the sample spent their spring breaks relaxing at home? what is the probability than between 48% and 58% of the college students from the sample spent their spring breaks relaxing at home? a. b, c. d, ording to the Bureau of Labor Statistics, the unemployment rate for workers aged 20 to 24 in February 2013