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A stock had returns of 8.4 percent, 8.7 percent, 6.9 percent, -0.3 percent, -9.8 percent, and -18.7 percent over the past six years. What is the arithmetic average return for this time period? 36 Instruction Enter vour response as a bercentage with two decimal places. For example, if your answer is 0.121312.13%, please only enter " 12.13", please do not enter "0.1213" or " 12.13%", the system may not recoknite the % sign You may pot negative slgns if necessary