I need help on number 7

Which of the following describes a simple event?

USPshnik [31]

Answer – B (Tossing a coin)
A simple event is an event where only one experiment happens at a time (such as tossing a coin), and the event has only one outcome. When two events are occurring simultaneously(such as spinning a spinner and drawing a card from a deck of cards, drawing 3 cards from a deck of cards or tossing 4 coins), then it is no longer a simple event; it is a complex event.

6 0

3 years ago

Read 2 more answers

Find the distance between the pair of points,(9, 3), (9,7)Set up the problem here:

Lostsunrise [7]

We are given the following two points.

$\mleft(9,3\mright)\: and\: (9,7)$

Let us find the distance between these two points.

Recall that the distance formula is given by

$undefined$

3 0

1 year ago

An educational psychologist wishes to know the mean number of words a third grader can read per minute.

Rama09 [41]

Answer: 208.

Step-by-step explanation:

The formula to find the minimum sample size is given by :-

$n= (\dfrac{z^*\times \sigma}{E})^2$ (1)

, where z* = critical z-value (two tailed).

$\sigma$ = Standard deviation ( from prior study ) and E = Margin of error.

As per given , we have

Margin of error : E= 0.29

Confidence level = 85%

Significance level = $\alpha=1-0.85=0.15$

Using z-table , the critical value (two -tailed)= $z^*=z_{\alpha/2}=z_{0.15/2}=z_{0.075}=1.439$

As per previous study , Variance = $\sigma^2=8.41$

$\sigma=\sqrt{8.41}=2.9$

Now, the required minimum sample size = $n= (\dfrac{(1.439)\times (2.9)}{0.29})^2$ [Substitute the values in formula (1)]

$n=(14.39)^2$

$n=207.0721\approx208$ [ Round to the next integer]

Hence, the minimum number of third graders that must be included in a sample = 208.

5 0

4 years ago

How do you write thirteen and seventy-two hundredths as a decimal number?

pashok25 [27]

Answer:

13.72

Step-by-step explanation:

4 0

2 years ago

Classify the following polynomials. Combine any

zavuch27 [327]

First simplify all polynomials and rewrite them in descending exponent order.

1. $-x^2+2x$

2. $x^3-4x^2$

3. $-2x^2+2x+3$

Now observe the terms with highest exponents in each expression, in particularly focus on their exponent value,

$-x^2$ with value of 2

$x^3$ with value of 3

$-2x^2$ with value of 2

The value is also known as order of polynomial and it is a way to classify polynomials.

Every order creates a family of polynomials determined by the order (which is always greater than -1)

A polynomial such as (1) and (3) have an orders of 2, which is often called quadratic order and thus the polynomials (1), (3) are classified in the same family of quadratic polynomials, these are polynomials with order of 2.

Polynomial (2) however has an order of 3, which is called cubic order. This polynomial (2) is classified in the family of cubic polynomials.

There are of course many other families, in fact, infinitely many of them because you have order 0, 1, 2, 3, and so on there are precisely $\aleph_0+1$ read as "aleph 0 + 1" (the number of natural numbers + 1 (because 0 is not a natural number)) of polynomial families.

The first few have these fancy names, for example:

order 0 => constant polynomial

order 1 => linear polynomial

order 2 => quadratic polynomial

order 3 => cubic polynomial

order 4 => quartic polynomial

and so on.

Hope this helps!

3 0

3 years ago