The mean grade in this class last semester was 78.3, and the variance was 49 . The distribution of grades was unimodal and symmetrical. Determine how many students are likely to fail the class (<60), and how many students are likely to get a "A" (>90), if 60 students are enrolled. Show all your work, and provide a sentence explaining each step of your calculation

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Lines a and b are parallel. what is the value of x? -5 -10 -35 -55

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem