You have to solve using the graph as it says solve graphically
So it will be y1-y2, so 15-20 is -5
Then x1-x2, so 10-15 is -5.
-5/-5 = 1
There’s ya slope : 1
The two fractions that added together give you a sum of -7/24 are 1/24+-8/24= -7/24
Answer: 100
5
Step-by-step explanation:
a) The mean of a normal distribution is also the median. Half the population will have values above the mean. Half of 200 is 100, so ...
... 100 students will have grades above 70%.
b) 84% is 14% above the mean. Each 7% is 1 standard deviation, so 14% is 2 standard deviations above the mean. The empirical rule tells you 95% of the population is within 2 standard deviations of the mean, so about 5% of students (10 students) got grades higher than 84% or lower than 56%. The normal distribution is symmetrical, so we expect about 5 students in each range.
... about 5 students will have grades above 84%.
