Stock prices: Following are the closing prices for a certain stock during June and July of a certain year.
June 482.37 493.37 498.72 485.52 484.78 474.02 487.01 488.50 483.19 497.99 488.56 486.25 482.05 472.68 472.08
July 456.56 467.49 475.83 489.20 491.34 494.02 459.61 466.18 481.59 477.50 484.81 490.06 488.97 492.63 484.35
(a) Find the population standard deviation and variance for the prices in June. Round the answers to at least three decimal places.
(b) Find the population standard deviation and variance for the prices in July. Round the answers to at least three decimal places.