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noname [10]
3 years ago
13

Jay Olshansky from the University of Chicago was quoted in Chance News as arguing that for the average life expectancy to reach

100, 18% of people would have to live to 120. What standard deviation is he assuming for this statement to make sense? Assume a normal distribution.Group of answer choices35.024.425.221.7
Mathematics
1 answer:
Alex17521 [72]3 years ago
5 0

Answer: 35

Step-by-step explanation:

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What is the mean?<br> 9.12.34.6.8.9.
NISA [10]

Answer:

13

Step-by-step explanation:

The mean is the average of the numbers. It is easy to calculate: add up all the numbers, then divide by how many numbers there are. In other words it is the sum divided by the count.

4 0
2 years ago
Read 2 more answers
weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probabi
kenny6666 [7]

Answer:

0.34134

Step-by-step explanation:

In other to solve for this question, we would be using the z score formula

z = (x - μ) / σ

x = raw score

μ = mean

σ = Standard deviation

We are told in the question to find the probability that a worker selected at random makes between $350 and $400

let x1 = 350 and x2= 400 with the mean μ = 400 and standard deviation σ = $50.

z1 = (x1 - μ) / σ = (350-400) / 50 = -1

z2 = (x2 - μ) / σ = (400 - 400) / 50 = (0/50) = 0

From tables, P(z <= -1) = 0.15866

P(z <= 0) = 0.5

Then, the probability would give us, P(-1 ≤ z ≤ 0) =0.5 - 0.15866 =

0.34134

Hence, The probability that a worker selected at random makes between $350 and $400 = 0.34134

7 0
3 years ago
Which figure best represents a kite?
never [62]
A kite would be the right answer
4 0
2 years ago
100 POINTS FOR BRAINLIEST! according to the image, whats the answer? Answer wisely for the full 100
stepan [7]

Answer:

Step-by-step explanation:

1. To find the area of a semicircle the formula is

A=\frac{\pi r^2}{2} \\=\frac{\pi 1^2}{2} \\=6.283m^2

The square

A=a^2=2^2=4m^2\\6.283+4=10.283m^2

2. Triangle

A=\frac{ab}{2} \\=\frac{6*2.5}{2} \\=7.5m^2\\7.5*2=15m^2

Rectangle

A=wl=8*13=104m^2

104-15=89m^2

3.

Semicircle

A=\frac{\pi r^2}{2} \\=\frac{\pi 3^2}{2} \\\\=14.137m^2

Square

A=a^2=6^2=36

36-14.137=21.863m^2

3 0
3 years ago
Read 2 more answers
Anne has a broken ruler. It starts at the 3-inch mark and ends at the 12-inch mark. Explain how Anne could use the ruler to meas
Alexandra [31]
She would start at the 3 inch mark and count from there.
6 0
3 years ago
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