What percent of students scored between 81.5 and 91.7? Please explain.

What percent of students scored between 81.5 and 91.7? Please explain.

how many students scored below 76.4? Please explain !

how many students scored between 76.4 and 86.6? Round if necessary, please explain.

If students scores X of 60% and 80% in an examination correspond to the standard scores of -0.58 and 1.42 respectively, Calculate the mean of X, the variance of X and the probability that a student...

Find the percent of juns whose score is no more than 90

a. A highly selective school decides that it will consider only applicants with a score in the top 5%. What will be the minimum score (cutoff point) that you must have in order to be considered for...

Tom and Jan are planning on applying to attend KSU. Tom takes the ACT while Jan decides to take the SAT. The mean score on the ACT is a 17 with a standard deviation of 5, and the SAT mean score is...

X1 and X2 are two dependent variables with the constraints: 0<=X1<=1, and 0<=X2<=1, 0<=X1+X2<=1; X1~N(0,1), then what is the distribution of X2? Thank you...

I am not very sure if I am able to pose the question properly, but I am having a lot of problem trying to justify a joint distribution derived from the marginals. I am given that: (yt+1...

Z= -0.12 Z=0

Z= -1.00 and Z=0

Z= -1.48 Z=0

Z= -2.00 and Z=0

There are 9 students in a class with different heights. 5 students are 150 to 172 cm (mean lies between 150 and 172cm) and 1 student is more than 185 cm. Find the mean and standard deviation. So...

Assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation equals 20. Find the probability that a randomly selected adult has an IQ less than...

P(x < 170) mean= 174 and the standard deviation = 20. I have to fine the indicated probability.

At the end of a computer course, students are given marks based on the projects that they handed in during the year. The marks are normally distributed with mean 82 and standard deviation of 12. The...

If female blood pressure is normally distributed with a mean of 114 and standard deviation of 19.8, find p12 and p77

The heights of 3-year-olds at a preschool averaged 35.2 inches, with a standard deviation of 1.2 inches. Assuming a normal distribution: a. 81.5% b.13.5% ...

I have 7 groups of data and the size of every group is 46. I want to do the parametric analysis of ANOVA between these groups. When every group of data has been checked for normality, the results...