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for the data given below find the a. mean b. median c. mode d quartiles e.range f. variance g. standard deviation h. coefficient of variation i....
for the data given below find the
a. mean
b. median
c. mode
d quartiles
e.range
f. variance
g. standard deviation
h. coefficient of variation
i. interquartile range
j .a generalization of the skewness using the histogram with 5 classes
45 55 60 65 65 65 68 70
75 75 80 85 90 95 120
2. Using Z-tables answer the following questions. The population mean is 73 and the population standard deviation is 5.
a. What are the z-values for the following intervals?
b. What are the probabilities that an item selected at random will fall in the interval?
i. 53 < x < 9
ii. x < 65
iii. 78 < x
3. A company manufactures watches. The watches are known from past observations to have an average life of 28 months and a standard deviation of watch lifetimes of 5 months. The distribution of lifetimes of the watches is normal. If the company does not want to make refunds on more than 12% of the watches it makes, how long should the guarantee period be (to the nearest month)?