Question 14 The frequency distribution of the speed, in kilometres per hour (km/h), of a sample of vehicles travelling on a national highway is given in the following table: Speed Frequency 105,5 - 110,5 110,5 - 115,5 115,5 - 120,5 4. 120,5 – 125,5 125,5-130,5 130,5 - 135,5 The best estimate of the standard deviation of the speed of the vehicles, rounded to two decimal places, is [1] 50,00 km/h. 123,00 km/h. 7,07 km/h. 2,77 km/h.

The grades for 20 students on the most recent exam are given in the data table below. Round your answers to 2 decimal places as needed 46 71 41 94 50 47 85 86 98 72 82 40 47 80 44 89 61 66 81 96 Mean = Median = Standard deviation = Minimum score = Highest score =

Question 2 of 10 To estimate the mean height of female high school juniors, you take a random sample of 30 female students and get these results (in inches): 72, 51, 67, 68, 61, 69, 58, 56, 60, 56 66, 61, 60, 59, 59, 54, 58, 53, 68, 63 57, 62, 63, 64, 56, 62, 58, 67, 57, 70 If the o is 5.3, based on past research, and you want to construct a 97% confidence interval using (estimate) ± (margin of error)= (estimate) ± z* what's your value for z*? O A. 1.645 В. 2.17 О с. 1.96 D. 2.576 O E. 1.88

How is a frequency distribution chart incorrectly constructed?