Exam two in this course had an average of twenty with a standard deviation of two, in a sample size of twenty. Based on this which statement would be correct using a ninety-five percent confidence interval. A. She would accept her null hypothesis.
B. It is reasonable to assume that the population average on the exam could be 21.
C. The value of the statistic she should use for her 95% confidence interval is 2.093
D. She would use the "Z" distribution instead of the "T" because the population standard deviation is unknown.

Answer: d. 39 cmin the diagram, the approximate length of the minor arc de is 39 centimetres.step-by-step explanation: the formula for the length of an arc in a circle is as displayed below.let the length of the minor arc de = xx = 2( pi )r × angle of sector / 360°from this, we will substitute the values given from the problem into the formula to obtain the length of the minor arc de.x = 2( pi )r × angle of sector / 360°r = radius = 25cmpi as an approximate value = 3.14angle of sector = 120°x = 2( 3.14 )( 25 ) × 120° / 360°x = 157 × 1 / 4x = 39.25x = 39 ( rounded to the nearest whole number as an approximate value )

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