We believe that 81% of the population of all business statistics i students consider statistics to be an exciting subject. suppose we randomly and independently selected 39 students from the population. what is the standard deviation of the number of students who consider statistics to be an exciting subject? use 2 decimal places.

2.45

Step-by-step explanation:

Formula to find standard deviation:

Given : The proportion of the population of all Business Statistics I students consider statistics to be an exciting subject : p= 0.81

Sample size of randomly selected students from the entire population : n=39

Then , the standard deviation of the number of students who consider statistics to be an exciting subject =

=

Hence, the standard deviation of the number of students who consider statistics to be an exciting subject= 2.45

b: |12 – x| ≤ 0.25

step-by-step explanation:      

let x be the possible lengths in inches, of the ribbons jaime cut.

we have been given that jaime is cutting strips of ribbon for a project. he tries to cut each piece to be 12 inches long, but sometimes he cuts it too long or too short by as much as 0.25 inch.  

we can represent this information in an inequality as:

by the definition of absolute value function we will get,

upon combining our inequalities we will get,

therefore, the inequality   describes all the possible lengths (x), in inches, of the ribbons jaime cut.

step-by-step explanation: