1.Let a1,a2,…,a10a_1, a_2, \ldots, a_{10}a1,a2,…,a10 be 101010 observations such that ∑k=110ak=50\sum_{k=1}^{10} a_k = 50∑k=110ak=50 and ∑1≤k<j≤10akaj=1100\sum_{1 \le k < j \le 10} a_k a_j = 1100∑1≤k<j≤10akaj=1100. Then the standard deviation of a1,a2,…,a10a_1, a_2, \ldots, a_{10}a1,a2,…,a10 is equal toa.555b.5\sqrt{5}5c.101010d.115\sqrt{115}115Login to continueOnly logged in users canattempt or see the solution.
