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lilavasa [31]
3 years ago
15

The amount of time it takes for a student to complete a statistics quiz seems to have a uniform distribution with a minimum time

of 18 minutes and the maximum of 50 minutes. The professor wants to reward(with bonus marks) students who are in the lowest quarter of completion times. What completion time should be used for the cutoff for awarding bonus marks?
Mathematics
1 answer:
Marina CMI [18]3 years ago
8 0
Q1 = 18 + 1/4(50 - 18) = 18 + 1/4(32) = 18 + 8 = 26

Therefore, the cutoff should be 26.
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Kristin spent $131 on shirts. Fancy shirts cost $28 and plain shirts cost $15. If she bought a total of 7 then how many of each
Tpy6a [65]
Hi there!!

First, Let plain shirts be x
Let fancy shirts be y 
x + y = 7
15x + 28y = 131 
Multiply first equation by 28 to eliminate y: 
28x + 28y = 196
<span>15x + 28y = 131 
</span>Subtracting the two equations:
13x = 65
<span>x = 5 </span>
Substituting x to get y:
x + y = 7
5 + y = 7
<span>y = 2 </span>
<span>Answer: 5 plain shirts and 2 fancy shirts
</span>
Hope this helps u!!
Have an amazing rest of ur day:)))
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madreJ [45]

Answer:

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erastovalidia [21]

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Step-by-step explanation:

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