For more than a century, doctors have been telling patients that a normal body temperature is 98.6F. This value

dates back to a study done by Carl Wunderlich in the mid-1800s. More recently, researchers conducted a study to

determine whether the "accepted" value for normal body temperature is accurate. They collected body temperatures

(in degrees Celsius) from 130 healthy individuals. A dotplot and numerical summaries of the data are given below.

(d) Calculate the standard deviation of the temperature readings in degrees Fahrenheit.