Given that zmr001-1.jpg = –2 and zmr001-2.jpg = –1, which of the following do you know? the variance is 10. the standard deviation is 30. the mean is 80. the median is 40. the data point x = 20 is 2 standard deviations from the mean. the data point x = 50 is 1 standard deviation from the mean. the data point x = 45 has a z-value of 1.5.

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.