A researcher is planning a study of graduate students' sleep deprivation. Assume that the population mean and standard deviation are provided, and a random sample of 25 students are drawn to participate. What statistical procedure is appropriate for conducting the study?

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Find the value of Discriminant \( (\Delta) \) )or the quadratic equation \( x^{2}+10 x+2=0 \)

3. The mean temperature of Monday, Tuesday and Wednesday is \( 40^{\circ} \mathrm{C} \). The mean temperature of Tuesday, Wednesday and Thursday is \( 41^{\circ} \mathrm{C} \). If the temperature of Thursday is \( 30^{\circ} \mathrm{C} \), then the temperature on Monday is: \( \begin{array}{llll}\text { (A) } 25^{\circ} \mathrm{C} & \text { (B) } 30^{\circ} \mathrm{C} & \text { (C) } 35^{\circ} \mathrm{C} & \text { (D) } 27^{\circ} \mathrm{C} \\ \text { (E) None of these } & & \end{array} \)

Write \( \sin 10 \mathrm{~A} \) in terms of ratios with angles of 5

(D) 7 i 25 mi in miantres.