To get to know her students better, Ms. Wilse surveyed her math students to determine wl hobbies and school subjects they prefer. Math Literature

The quantity of dissolved oxygen is a measure of water pollution in lakes, rivers, and streams. Water samples were taken at four different locations in a river in an effort to determine if water pollution varied from location to location. Location I was 500 meters above an industrial plant water discharge point and near the shore. Location II was 200 meters above the discharge point and in midstream. Location III was 50 meters downstream from the discharge point and near the shore. Location IV was 200 meters downstream from the discharge point and in midstream. The following table shows the results. Lower dissolved oxygen readings mean more pollution. Because of the difficulty in getting midstream samples, ecology students collecting the data had fewer of these samples. Use a 5% level of significance. Do we reject or not reject the claim that the quantity of dissolved oxygen does not vary from one location to another? Location I Location II Location III Location IV 7.6 6.3 4.6…

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Calculate a student's grades used weighted average follows. The second test was the midterm, it is worth twice the normal test. The fifth test will be the final and it is worth 3 times a normal test. What will he need under these conditions to earn a 90 average if the first four tests were 75, 92, 95, and 80?