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3 years ago

I need helllpppp ppllsssss

Mathematics

1 answer:

Alina [70]3 years ago

8 0

Answer:

Step-by-step explanation:

Tip a positive number multiplied to a negative number is negative

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A person's blood pressure is monitored by taking 4 readings daily. The probability distribution of his reading had a mean of 13

ss7ja [257]

Answer:

a) Mean = 133, Standard deviation = 2.5

b) Normal distribution

c) 0.0026

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 4

Mean = 133

Standard deviation = 5

a) Mean and the standard deviation of the sampling distribution of the sample mean for the four observations each day.

The sampling distribution has a mean equal to the population mean

$\bar{x} = \mu = 133$

The standard deviation of the sampling distribution is given by:

$\sigma_s = \dfrac{\sigma}{\sqrt{n}} = \dfrac{5}{\sqrt{4}} = 2.5$

b) Shape of the sampling distribution

Central limit theorem:

When a large sample is drawn from a normal distribution, then the distribution of sample means approaches a normal distribution.

Since the distribution is normal, the sampling distribution of the sample mean will be bell shaped and follow a normal distribution.

c) P(sample mean exceeds 140)

$P( x > 140) = P( z > \displaystyle\frac{140 - 133}{2.5}) = P(z > 2.8)$

$= 1 - P(z \leq 2.8)$

Calculation the value from standard normal z table, we have,

$P(x > 140) = 1 - 0.9974 = 0.0026$

0.0026 is the probability that the sample mean exceeds 140.

6 0

3 years ago

What multiplies to 45 and adds to 10

adelina 88 [10]

I dont think anything does.

6 0

4 years ago

Jenn's garden is a rectangle with length 3.5 meter and width 0.75 meters

MAVERICK [17]

Answer:

greater

Step-by-step explanation:

8 0

3 years ago

It costs $3.99 for 25 fl. oz. of

lana [24]

Answer:

6.99

Step-by-step explanation:

The 6.99 one because it has more detergent in it. So you get more from your money.

6 0

4 years ago

The following table shows the length and width of a rectangle: Length Width Rectangle A 4x 5 3x − 2 Which expression is the resu

tresset_1 [31]

The perimeter of the rectangle, for the dimensions shown in table is (14x+6) and the perimeter is polynomial.

<h3>What is perimeter of rectangle?</h3>

The measure of the boundary of a rectangle is called its perimeter. Perimeter of a rectangle is the sum of all the sides.

The perimeter of a rectangle is twice the sum of its length and width. It can be given as,

$P=2(w+l)$

Here (<em>w</em>) is the width of the rectangle and (<em>l</em>) is the length of the rectangle.

The width of the rectangle is,

$w=3x-2$

The length of the rectangle is,

$l=4x+5$

As the perimeter of rectangle is twice the sum of its length and width. Thus the perimeter of the given rectangle is,

$P=2[(3x-2)+(4x+5)]\\P=2[3x-2+4x+5]\\P=2[7x+3]\\P=14x+6$

As the perimeter of the given rectangle in the above equation is in the polynomial form. Thus, the perimeter of the rectangle is (14x+6) and the perimeter is polynomial.

Learn more about the perimeter here;

brainly.com/question/1662271

3 0

2 years ago

Read 2 more answers