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A normal distruibution of 640 observations has a mean of 1800 cm and a standard deviation of 90 cm.
A) Draw a representative diagram for the distribution.
B) Determine the proportion of observations (i)between 1620 cm and 1980 cm (ii) between 1710 cm and 2070 cm (iii)above 1890 cm (iv) below 2070 cm.
C) Determine the number of observations (i)between 1710 cm and 1890 cm; (ii)between 1530 cm and 1620 cm;(iii)below 1890 cm; (iv)above 2070 cm
The length of country and western songs is normally distributed and has a mean of of 170 seconds with a standard deviation of 49 seconds. find the probabality that a random collection of 16 songs will have a mean of 158.30 seconds or less?
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