Considering the problems, we have that:
3. An histogram is recommend, hence option A is correct.
4. The standard deviation for the data-set is of 53.55 billion, hence option A is correct.
An histogram is a graph that shows the number of times each element of x was observed. Hence it is recommended for item 3, as the table gives the number of times each response was observed.
In this problem, the mean is given by:
M = (231 + 104.3 + 87.6 + 126.9 + 131.9 + 105.8 + 136.9 + 43.9)/8 = 121.0375.
Hence the standard deviation is:
[tex]s = \sqrt{\frac{(231-121.0375)^2 + (104.3-121.0375)^2 + (87.6-121.0375)^2 + (126.9-121.0375)^2 + (131.9-121.0375)^2 + (105.8-121.0375)^2 + (136.9-121.0375)^2 + (43.9-121.0375)^2}{8}} \approx 53.55[/tex]
Hence option A is correct.
More can be learned about the standard deviation of a data-set at https://brainly.com/question/12180602
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