100 POINTS, HELP ASAP, will mark as brainliest. A teacher surveyed her class after they had taken a vocabulary test. Eighteen of the students claimed they had studied at least one hour for the test. The remaining twelve students admitted that they had not studied for the test at all. The test results (expressed as a percent) for the two groups are shown below.

Studied: 87, 100, 94, 79, 92, 100, 95, 83, 89, 99, 100, 91, 89, 95, 100, 93, 96, 83

Did Not Study: 82, 72, 45, 91, 58, 83, 65, 87, 90, 77, 73, 89

Part 1: Calculate the mean of the group that studied, rounded to the nearest tenth.

Part 2: Calculate the mean absolute deviation of the group that studied, rounded to the nearest tenth.

Part 3: How many of the scores (from the group that studied) are within one mean absolute deviation of the mean.

Step-by-step explanation:  Given  

Marks of 18 students studied more than 1 hr

88, 100, 94, 79, 92, 100, 95, 83, 89, 99, 100, 91, 89, 95, 100, 93, 96, 84

Marks of 12 students studied did not study

82, 72, 45, 91, 58, 83, 65, 87, 90, 77, 73, 89

To Find : Choose correct options :

There is no mode of the group that studied.

In general, those students that studied scored much higher than those students that did not study.

The mean of the group that studied is over 15 percentage points higher than the mean of the group that did not study.

The median of the group that studied is over 95.

The median of the group that did not study is less than 80.

Step-by-step explanation:

Marks of 18 students studied more than 1 hr

88, 100, 94, 79, 92, 100, 95, 83, 89, 99, 100, 91, 89, 95, 100, 93, 96, 84

arranging in order

79, 83,  84 , 88, 89,  89,  91,  92, 93, 94, 95,95, 96, 99, 100, 100, 100, 100

Median = (93 + 94)/2  = 93.5

The median of the group that studied is NOT over 95.

Mean = (79+83+84+88+89+89+91+92+93+94+95+95+96+99+100+100+100+100)/18

= 1667/18 =  92.61

MODE = 100

There is no mode of the group that studied. - FALSE

Marks of 12 students studied did not study

82, 72, 45, 91, 58, 83, 65, 87, 90, 77, 73, 89

arranging in order

45,  58, 65,  72, 73,  77,  82, 83, 87, 89 , 90,  91

Median = (77 + 82)/2 =  79.5

The median of the group that did not study is less than 80.   TRUE

MODE = There is no Mode

Mean = (45+58+65+72+73+77+82+83+87+89+90+91)/12

= 912/12

= 76

92.61 - 76  = 16.61

mean of the group that studied is over 15 percentage points higher than the mean of the group that did not study. TRUE

In general, those students that studied scored much higher than those students that did not study. TRUE

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