Use the probability distribution to complete parts (a) and (b) below. The number of schoolrelated extracurricular activities per student Activities 0 1 2 3 4 5 6 7 CI Probability 0.058 0.121 0.162 0.178 0.216 0.127 0.085 0.053 (E (3) Find the mean. variance, and standard deviation of the probability distribution. The mean is El. (Round to one decimal place as needed.) The variance is D. (Round to one decimal place as needed.) The standard deviation is El. (Round to one decimal place as needed.) (b) Interpret the results. The mean is D, so the average student is involved in The standard deviation is D, so the typical number of activities per student (Round to one decimal place as needed.) ._. (Round to one decimal place as The variance is D. deviates from the mean by about 4 activities. (Round to one decimal place as deviates from the mean by more than 4 activities. The standard deviation is El. (Round to one decrmal place as does not deviate from the mean. (b) Interpret the results. deviates from the mean by about 2 activities. The mean is D, so the average viation is D, so the typical (Round to one decimal place as needed.) The variance is (Round to one decimal place as needed.) no activities. The standard deviation is at least 5 activities. (Round to one decimal place as needed.) (b) Interpret the results. 3 or 4 activities. The mean is so the average student is involved in The standard deviation is so the typical number of activities per student (Round to one decimal place as needed.)