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

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

answ9x x 3=

step-by-step explanation:

answer

a,b, and d

explanation

a reflection angle is more than

but less than;

an angle that measures

is a reflex angle.(true)

an angle that measures less than

is acute.(true)

provided we are considering angles greater or equal to zero.

an acute angle lies in the range.

an obtuse angle is less than 180° but more than 90°

an angle that measures 300° is obtuse (false)

an angle that measures 65° is an acute angle.(true)