The table displays the scores of students on a recent exam. Find the mean of the scores to the nearest 10th.
Score Number of Students
65
4.
70
2
75
2
80
1
85
7
90
5

Solution

x f fx

65 4 260

70 2 140

75 2 150

80 1 80

85 7 595

90 5 450

total N=21 Summation fx=1675

We know

Mean= Summation fx/N

=1675/21

=79.8

Hence, the required mean is 79.8 ans.

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

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