A large electronics company requires each agent to visit a store that sells its products at least 20 times a year. The visit was used to introduce new products and technological developments. From the results of a survey conducted on 30 agents in several big cities, it turns out that on average, agents visit stores 28 times with a standard deviation of 4 times. Test with = 1%, whether there is a significant difference between a visit to the dealer's shop and the assigned obligation.

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A: Given that, mean(μ)=10.25 standard deviation(σ)=2.3

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