We want to find $P(t \ge -1.86)$. Using a t-table or calculator, we find the probability. Since the t-distribution is symmetric around 0, $P(t \ge -1.86) = P(t \le 1.86) + P(t=1.86)$. Since $P(t=1.86) = 0$, we have $P(t \ge -1.86) = P(t \le 1.86)$. Using a
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