A market investigator returns the following data: Of 1000 people consulted, 81 1 liked chocolates, 752 liked toffee and 418 liked boiled sweets, 570 liked chocolates and toffee, 356 liked chocolates and boiled sweets and 348 liked toffee and boiled sweets, 297 liked all three. Show that this information as it stands must be incorrect.

The first four moments of a distribution about the value 4 of the variable are –1.5, 17, –30 and 108. Find the moments about mean, .

Find the average rate of
a) motion in case of a person who rides the first mile at 10 mile/hour, the next mile at 8 mile/hour and the third mile at 6 mile/hour ; and
b) increase in population which in the first decade has increased 20%, in the second 25% and in the third 44%.

a) obtain a measure of the association between blindness and insanity in each of the age groups.

b) Do you consider that blindness and insanity are equally associated or disassociated with each other in two age groups or more in one-group than in other?

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