In order to determine the average weight of watermelons at a supermarket, a sample of 31 watermelons was weighed. The average weight was found to be 7.9 kg with a standard deviation of 2.1 kg. Determine a 90% confidence interval for the mean weight of watermelons in the supermarket. State the lower limit only (in kg) correct to two decimal places.

Write the answers as a fraction in reduced form.Do you know what regifting is? It is loosely defined as "giving someone a gift that was originally given to you without telling the recipient the origin of the gift." Now that you know, how often do you engage in regifting? In a survey of 5555 persons, the answers to that question were as follows. Response to the question: How often do you engage in regifting?Very often → 146 votesEvery now and then → 819 votesNot very often → 1756 votesNever → 2808 votesI'm not sure → 26 votesCurrent number of voters: 5555 If one of the persons is selected at random, what is the empirical probability of the following? (a) The person very often engages in regifting. (b) The person never engages in regifting.(c) If you get a gift and you assume that the results of the survey apply to that gift, what is the probability that you are getting a regift? Assume that the people who give regifts are the ones that did not answer "Never."

A school is going to offer a new class next year. The school polls the students to see which class they would prefer. 47% respond that they would like East Asian History. 53% respond that they would like Southern African Studies. The margin of error for the poll is +4%. Explain whether the poll clearly indicates the majority's preference.

26)

Fill in the remaining entries in the two-way table shown to the right. A survey of 140 patrons at a restaurant gave the preferences for entrees and drinks shown to the right. Fill in the missing entries in the table. Vegetarian Meat/Fish 51 Wine No Wine Total 38 Total 66 140

The u for days absent from class per month is 4.3. The teacher begins a policy of pop quizzes to see if it affects attendance. What are Ha and Ho?