# Statistics

An instructor has graded 25 exam papers submitted by students in a class of 26 students, and the average so far is 71. (The maximum possible score is 100.)

A) To raise the class average by 1 point, the score on the last paper has to be:

1. 👍 0
2. 👎 0
3. 👁 398
1. 71 = S/25 so S = 1775 the present sum of all scores after 25 grades

72 (26) = (1775+x)

1872 = 1775 + x

x = 97

1. 👍 0
2. 👎 0

## Similar Questions

1. ### math

Find the number of different ways that an instructor can choose 7 students from a class of 35 students for a field trip.

asked by em on August 5, 2019
2. ### math

mr. Rodriguez, a college instructor, can grade his class papers in 3 hours while it takes his assistant 4 1/2 hours. If Mr. Rodriguez graded the papers for 1 hour and then left the job for his assistant to complete, how long will

3. ### AP Statistics

Your mathematics instructor claims that, over the years, 88% of his students have said that math is their favorite subject. In this year's class, however, only 21 out of 32 students named math as their favorite class. The

asked by Blegh on November 3, 2012
4. ### math

75% of the students in a class passed an exam if 2 more students had passed the exam , 80% would have been successful . how many students are there in the class.

asked by loveleen on January 13, 2016
5. ### algebra

students in a biology class just took a final exam. a formula for predicting the average exam grade on a similar test t months later is. s(t)=78-15log(t+1) (a)find the students average score when they first took the final exam.

asked by selina on May 11, 2010
1. ### Algebra

In a school of 464 students, 89 students are in the band, 215 students are on sports teams, and 31 students participate in both activities. How many students are involved in neither band nor sports? A.160 students B.191 students

asked by Cassie on February 20, 2013
2. ### Statistics

A history class is comprised of 5 female and 8 male students. If the instructor of the class randomly chooses 8 students from the class for an oral exam, what is the probability that 2 female students and 6 male students will be

asked by Ryan on March 10, 2015
3. ### math

A class of 43 students took an exam. Their mean grade average is 67 and standard deviation is 7. a) how many students should get a C? b) how many should get a B? c) what score is necessary to get an A?

asked by devon on November 14, 2008
4. ### stats

Relatively speaking, which statistics exam did you do better on? On your first statistics exam you scored a 72 and on the second exam you scored an 89. Hey, youâ€™re improving! Or are you? On the first exam, the class mean was 71

asked by kelly on February 5, 2013
5. ### Statistics

In Professor Smith's statistics course, the correlation between students' total scores before the final exam and their final exam scores is r = 0.67. The pre-exam totals for all students in the course have a mean of 275 and a

asked by Jannel on February 1, 2009
6. ### Math ---HELP!!!!!

sample of nine students is selected from among the students taking a particular exam. The nine students were asked how much time they had spent studying for the exam and the responses (in hours) were as follows: 18, 7, 10, 13, 12,

asked by angela on May 30, 2016