Elementary and secondary schools were classified by the number of computers they had. Computers 0-24 25-49 50-74 75-99 100+
Schools 752 3352 18865 14016 46805
Choose one of these schools at random. Find the probability that it has
a) 75 or more computers.
b) Less than 75 computers.
c) Less than 100 computers.

Step-by-step explanation:

Given

The table

First, we calculate the amount of schools

Solving (a): Probability of 75+ computers.

From the given table, schools with 75 or more computers have the population of:

The probability is calculated as:

Solving (b): Probability of less than 75 computers.

From the given table, schools with less than 75 computers have the population of:

The probability is calculated as:

Solving (c): Probability of less than 10 computers.

From the given table, schools with less than 100 computers have the population of:

The probability is calculated as:

step-by-step explanation:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

step-by-step explanation:

given that megan owns a clothing boutique.

the profits of 2010, 11, are recorded and shown as follows:

years since     2010 0     1     2     3       4       5

profits made in 1000's   39       84     111     120   111     84

we find that profit gradually increases form 2010 to 2013 upto 120,   then starts decreasing.

the profits for 2012 and 2014 are the same while that of 2011 and 2015 are also the same.

this shows that there is symmetry about the line profit = 120000

hence answer is:

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is           symmetric about the line y = 120,000.

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step-by-step explanation: