ريض٣٦٣: حل مسائل على التوزيع الطبيعي والمعياري١

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ممكن حل هذا السؤال؟ The mean height of 500 female at certain school is 151 cm, with standard deviation of 15 cm . Assuming normal distribution, find the number of students with heights: 1-Between 120 and 155 cm 2-Less than 170 cm 3-More than 185 cm 4-Out of the range of 120 and 155 cm 5-What level cuts off the lower 10% of the height 6-What levels encompass 95% of the height 7-More than 190 cm