Given that a real estate company is interested in the ages of home buyers. They examined the ages of thousands of home buyers and found that the mean age was 48 years old, with a standard deviation of 9 years.

X the ages of home buyers is N(48, 9)

a) $30\leq x\leq 66\\|x-48|\leq 18\\|x-48|\leq 2\sigma$

Hence using Cheby chev inequality

$P(|x-48|\leq 2\sigma)\geq 1-\frac{1}{2^2} \\=0.75$

b) $25.5\leq x\leq 70.5\\|x-48|\leq 22.5\\|x-48|\leq 1.5\sigma$

$P(|x-48|\leq 1.5\sigma)\geq 1-\frac{1}{1.5^2} \\=0.556$

c) Using normal distribution we have

$P(|x-48|\leq 2\sigma)=0.95$

d) z value is 2.97

Hence x lies between

$(48-9*2.97, 49+9*2.97)\\=(21.27,74.73)$

Between 21 years and 75 years

4 0

4 years ago

How to add mixed numbers and regroup them

UNO [17]

1st Convert into a top heavy fraction or improper fraction

<h3> like for example 3 1/2 so you times the 3 by 2 which is 6 and add that one so it will be 7/2</h3><h3>lets say your adding that to 2 1/2 you convert that which is 5/2 </h3><h3>5/2 and 7/2 have the same denominator so you add 5 and 7=12 12/2 and 2 goes into 12 6x so it is just 6 </h3><h3>THIS IS AN EXAMPLE</h3><h3>TO REGROUP THEM </h3><h3>Lets say its </h3><h2>21/4</h2><h3>YOU DIVIDE 21 BY 4 WHICH IS 5 WITH AN REMAINDER OF 1 SO YOU DO THAT 5 AS A BIG NUMBER AND THAT ONE GES ABOVE THE FOR LIKE 5 $\frac{1}{4\\} \\$ </h3><h3>SO I TRIED :)</h3>

7 0

4 years ago

More points also what is 2x3+4x6x8+9

-Dominant- [34]

Answer:

the answer is 207

Step-by-step explanation:

using bodmas

7 0

3 years ago

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