A group of 120 students sat a history exam. The cumulative frequency graph shows thescores obtained by the students.1201008060402020406080100Examination score(a) Find the median of the scores obtained.The students were awarded a grade from I to 5, depending on the score obtained in the exam.The number of students receiving each grade is shown in the following table.2 3 4 3GradeNumber of students1326(b) Find an expression for a in terms of b.(This question continues on the following page)Cumulative frequency (Question 9 continued)(c) The mean grade for these students is 3.65.(i)Find the number of students who obtained a grade 5.(ii) Find the minimum score needed to obtain a grade 5.

From the given cumulative frequency graph, we need to find required answers.

Answered: A group of 120 students sat a history…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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What are the relative frequencies
The Acme Company manufactures widgets. The distribution of widget weights is bell-shaped. The widget weights have a mean of 40 ounces and a standard deviation of 10 ounces. Use the Standard Deviation Rule, also known as the Empirical Rule. Suggestion: sketch the distribution in order to answer these questions. a) 99.7% of the widget weights lie between and b) What percentage of the widget weights lie between 20 and 70 ounces? c) What percentage of the widget weights lie above 30 ? Question Help: Video Message instructor %
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