PLEASE HELP ME FIND THIS PERCENTAGE FOR MATHSWATCH

The percentage of people who took less than 30 seconds is 71.4%

Step-by-step explanation:

Percentages

Given the frequency f of an event with n possible outcomes, the percent frequency pf is given by:

We are given a histogram where it's shown the frequency of the times people took to complete a task.

We are required to find the percentage of people who took less than 30 seconds to complete the task.

There were 40 persons that took 5 to 15 seconds.

There were 35 persons that took 15 to 25 seconds.

There were 20 persons that took 25 to 45 seconds. This last category is not valid for our required percentage because it includes people with more than 30 seconds, thus, f=40+35=75

The total number of persons recorded in the histogram is:

n = 40+35+20+10=105

Calculating:

pf = 71.4%

The percentage of people who took less than 30 seconds is 71.4%

answer: standard form is ax^2 + bx + c = 0

step-by-step explanation:

standard form is ax^2 + bx + c = 0

(2x + 1)(x - 2) = 0

distribute to get into standard form

2x^2 - 4x + x - 2 = 0

2x^2 - 3x - 2 = 0

a = 2, b= -3, c = -2

a is your answer

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step-by-step explanation: