Ateacher gives a test to a large group of students. the results are closely approximated by a normal curve. the mean is 74, with a standard deviation of 8. the teacher wishes to give a's to the top 8% of the students and f's to the bottom 8%. a grade of b is given to the next 16%, with d's given similarly. all other students get c's. find the bottom cutoff for a grade of c.

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step-by-step explanation:

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step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

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7 hours, 0 minutes, 0 seconds

or:  

0.04

total weeks

or:  

0.29

total days

or:  

7.00

total hours

or:  

420.00

total minutes

or:  

25,200.00

total seconds

step-by-step explanation: