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Orlov [11]
3 years ago
10

Suppose a variable X (systolic blood pressure) is normally distributed with a variance of 36. If approximately 0.25 of the value

s of X are less than 88, what is the mean of X g?
Mathematics
1 answer:
Kazeer [188]3 years ago
3 0

Answer:

92.044

Step-by-step explanation:

The variance = 36

σ² = 36 = 6

The probability that x is less than 88 is equal to 0.25

So probability of (x<z) = 0.25

From the z table, z = -0.674

Using the z formula,

z = x-u/σ

Z = -0.674

X = 88

σ = 6

When we insert these formula we have:

-0.674 = 88 - u/6

6 x -0.674 = 88- u

-4.044 = 88 - u

92.044 = u

Therefore from the calculations above the mean of X is 92.044 and it is approximately 92.

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Vikki [24]

Answer:

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Step-by-step explanation:

To factor out -3/4 out of that equation, multiply and divide by -3/4.

Say ;

=\frac{3}{2}x -\frac{9}{4}y

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Now, rearranging and making necessary commutations.

=-\frac{3}{4} \times (\frac{3}{2}x -\frac{9}{4}y) \times \frac{1 }{-\frac{3}{4}}

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Factoring -3/4 we get an equation without any fractions

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3 0
3 years ago
A grocery store sells 6 bottles of water for $4 and 18 bottles of water for $10. Which is the better deal and why?
nasty-shy [4]

Answer:

18 bottles of water for $10 because each bottle costs 56c compared to 6 bottles of water for $4 at 67c

Step-by-step explanation:

All values rounded to the hundredth

6 bottles of water for $4

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18 bottles of water for $10

10/18=0.56

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6 0
2 years ago
Question 4 of 10
soldi70 [24.7K]

Answer:

d. y=5x-3

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Substitute with those values and then you have the equation.

3 0
2 years ago
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If a b and m∠2 = 71°, what is m∠1?
Nikolay [14]

Answer:

  71°

Step-by-step explanation:

In order to be able to solve this problem, we must assume the relation between lines "a" and "b" is that they are parallel.

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