Question

Chocolate

【問題英語ですみません】統計の問題なのですが、答えがどうも違う様に思えて仕方ありません。
答えの説明がskewed-leftの話をしていたのに突然skewed-rightの話になってませんか？
教えていただけると嬉しいです。よろしくお願いします🙇‍♂️

e. 88.69; she qualified.
29.The table below is a calculation of the grade breakdown of 500 students who are taking introductory
psychology at a university. The grades are on a 100-point scale, and the table divides the students into
percentiles. Which of these statements is NOT correct?
Percentile
Grade
10
43
20
55
30
68
40
72
50
75
60
81
70
90
a. This distribution is skewed left.
b. The mean grade for the 500 students is greater than the median grade.
80
92
c. There are no high outliers among these students.
d. More students are doing well in the class than are doing poorly in the class.
e. All of these statements are correct.
30. In a scatternlot
90
95
99
100

29. From Chapter 5
The correct answer is (b). This distribution is skewed left. Notice that the spread
between the top three percentiles is much smaller than the spread between the
bottom three percentiles. In a skewed-right distribution, the mean is much smaller
than the median, making (b) the correct answer. In a skewed-left distribution, there
the top half of the data is very close together, which means that even a student with
a perfect grade of 100 will not be an outlier. And this skewness tells us that more
students are doing well and a smaller percentage are doing poorly. Over 60% have
scores over 72 while only 30% have low scores.