Students monitor surveys 1200 undergraduates from 100 colleges semiannually to understand trends among college students. recently, the students monitor reported that theaverage amount of time spent per week on the internet was 19.0 hrs. assume that the standard deviation is 5.5 hours.
(a) give the mean and standard deviation in minutes.
(b)calculate the 95% confidence intervial in minutes from your answer
(c)explain how you could have directly calculated this intervial from the 95% that you calculated in the previous exercise

It should be a or d i’m not sure

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 )