Explain how we got the 4th answer

According to one year's C291 Student Survey, the mean height of males is 177 cm. with a standard deviation of 7.5 cm. Assume that these results are true for the population of all C291 students. For each statement, decide whether it is True or False. Hint: Use the 68-95-99.7 Rule. i. The chance that the height of one randomly chosen male C291 student is between 169.5 and 184.5 is about 68%. True il. The chance that the mean of a random sample of 25 male C291 students is between 169.5 and 184.5 is about 68%. False ill. The chance that the height of one randomly chosen male C291 student is between 175.5 and 178.5 is about 68%. False iv, The chance that the mean of a random sample of 25 male C291 students is between 175.5 and 178.5 is about 68%. True