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Nina [5.8K]
2 years ago
12

The life expectancy in the US is 75 with a standard deviation of 7 years. A random sample of 49 individuals is selected. What is

the probability that the same mean will be larger than 77 years?
Mathematics
1 answer:
victus00 [196]2 years ago
7 0

Answer:

0.02275

Step-by-step explanation:

We use this z score formula to solve for this question

z-score is is z = (x-μ)/σ/√n

where x is the raw score

μ is the population mean

σ is the population standard deviation

From the above question,

x = 77

μ = 75

σ = 7

number of samples = 49

Hence, the z score = 77 - 75/ (7/√49)

= 2/(7/7)

= 2/1

= 2

Hence, the z score = 2

Using the z table to find probability

P(x<77) = 0.97725

P(x>77) = 1 - P(x<77)

= 1 - 0.97725

= 0.02275

Therefore, the probability that the same mean will be larger than 77 years

is 0.02275

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RSB [31]

Answer:

This cannot be solved but it can be simplified

first we open the bracket

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a²- abx/x = 2/3

next we cross multiply so it will be 3(a² - abx) = 2x

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3a² - 3abx = 2x

Next we factorise so we can get

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I dont know what exactly you where asked but I hop this helps

7 0
2 years ago
Find the next three terms of the arithmetic sequence 5, 9, 13, 17, … .
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Hi there!

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6 0
3 years ago
HELP THIS IS DUE IN 15 MINUTES I DONT KNOW HOW TO SOLVE IT!!!
NARA [144]

Answer:

(x,y)=(-10, -30)

Step-by-step explanation:

x/4 -y/12 = 0

--> x/4 = y/12

substitute into the first eq.

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2y/12 = -5

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8 0
2 years ago
Find the midpoint of (-8,-10) and (8,0)
Allisa [31]

Answer:

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Step-by-step explanation:

You just have to find the middle of each one

From -8 to 8 there are 16 numbers so you divide 16 by 2 which would be 8 and add that to -8 giving you 0

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6 0
2 years ago
A road sign says that there is an exit in 3/4 of a mile. How many metres is this? (Use the Unit Conversions in your formula shee
viva [34]
I think we will need to use the 1mile=5280ft and the 1ft=30.48cm and the 1metre=100cm


so
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times both sides by 3960
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answer is 1207.008 meters
round

1207 meters

3 0
3 years ago
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