The mean final exam score of 35 students who had calculus in high school is 77.3 (with a standard deviation of 6.8); while the mean exam score of 23 students who had not had calculus in high school is 73.6 (with a standard deviation of 7.4). What is the standard error for a confidence interval comparing these two means? Question 3 options:

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

The human resources manager at a company records the length, in hours, of one shift at work, x. he creates the probability distribution below. what is the probability that a worker chosen at random works at least 8 hours? probability distribution px(x) 6 hours 7 hours 8 hours 9 hours 10 hours 0.62 0.78 пол

If m∠abc = 70°, what is m∠abd? justify your reasoning.  using the addition property of equality, 40 + 70 = 110, so m∠abd = 110°.  using the subtraction property of equality, 70 − 30 = 40, so m∠abd = 30°.  using the angle addition postulate, 40 + m∠abd = 70. so, m∠abd = 30° using the subtraction property of equality.  using the angle addition postulate, 40 + 70 = m∠abd. so, m∠abd = 110° using the addition property of equality.