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Softa [21]
3 years ago
7

An instructor wants to compare final grades of students in her online class and face-to-face class. Instructor selects 10 studen

ts randomly from each class and the following table shows the final grades of those students.
5.5
7
6
7
6.5
6
9
6.5
6.5
6.5

The 81st percentile of time students sleep per night is ______hours.
Mathematics
1 answer:
LiRa [457]3 years ago
8 0

Answer:

7 hours

Step-by-step explanation:

The formular of percentile is given as;

n = (P / 100) * N

where;

n = ordinal rank

P = Percentile

N = Number of values

The grades are given as;

5.5,  7,  6,  7, 6.5,  6,  9 , 6.5,  6.5 , 6.5

Arranging in increasing order;

5.5, 6, 6, 6.5, 6.5, 6.5, 6.5, 7, 7, 9

n = (81/100) * 10 = 8.1 ≈ 8

The 81st percentile is the 8th term.

The 8th term = 7

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3 years ago
(-5c - 3) - 2 = -10c + 20 <br> How would I find c?
Ksivusya [100]
<span>(-5c - 3) - 2 = -10c + 20
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Erika worked 14 hours last week and 20 hours this week. If she earns $9 per hour, how much did she earn these two weeks?
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In the Cash Now lottery game there are 8 finalists who submitted entry tickets on time. From these 8 tickets, three grand prize
alexgriva [62]

Answer:

The number of ways is  \left n} \atop {}} \right. P_r  =  336

Step-by-step explanation:

From the question we are told that

   The number of tickets are   n = 8

    The number of finalist are r   =3

Generally the number of way by which this winners can be drawn and arrange in the order of   1^{st} , \  2nd ,  \  3rd    is mathematically represented as

             \left n} \atop {}} \right. P_r  =  \frac{n\ !}{(n-r) !}

substituting values

             \left n} \atop {}} \right. P_r  =  \frac{ 8!}{(8-3) !}

           \left n} \atop {}} \right. P_r  =  \frac{ 8* 7*6*5*4*3*2*1}{ 5*4*3*2*1}

           \left n} \atop {}} \right. P_r  =  336

3 0
3 years ago
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