The Japanese yen to US dollar exchange rate over the past seven days has been: 112, 115,

Question:

The Japanese yen to US dollar over the past seven days has been:

112, 115, 111, 116, 116, 116, 112

Compute the range, the MAD, the variance, and the standard deviation or the data. Interpret each of these measures of dispersion. Exchange Rate
The value of one currency for the purpose of conversion to another. Exchange Rate means on any day, for purposes of determining the Dollar Equivalent of any currency other than Dollars, the rate at which such currency may be exchanged into Dollars...