a random sample of math majors taking an introductory statistics course were surveyed after completing the final exam. they were asked, "how many times did you review your final exam before handing it in to the professor?" the results are displayed in a probability density function for the random variable x, the number of times students reviewed their exam before handing it in. find the standard deviation of x.

C= 5 9 (f−32) the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true? a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of 5 9 degree celsius. a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit. a temperature increase of 5 9 degree fahrenheit is equivalent to a temperature increase of 1 degree celsius. a) i only b) ii only c) iii only d) i and ii only