Please help with this I’m lost

28% of what number is 21.

Katena32 [7]

Answer:

i think it´s 75..

Step-by-step explanation:

4 0

3 years ago

A quality control inspector has drawn a sample of 10 light bulbs from a recent production lot. Suppose 20% of the bulbs in the l

Neko [114]

Answer:

The probability is 0.0008.

Step-by-step explanation:

Let X represents the event of defective bulb,

Given, the probability of defective bulb, p = 20 % = 0.2,

So, the probability that bulb is not defective, q = 1 - p = 0.8,

The number of bulbs drawn, n = 10,

Since, binomial distribution formula,

$P(x=r) = ^nC_r p^r q^{n-r}$

Where, $^nC_r = \frac{n!}{r!(n-r)!}$

Hence, the probability that exactly 7 bulbs from the sample are defective is,

$P(X=7)=^{10}C_7 (0.2)^7 (0.8)^{10-7}$

$=120 (0.2)^7 (0.8)^3$

$=0.000786432$

$\approx 0.0008$

6 0

3 years ago

Which graph represents the function f(x) = (x – 3)2? On a coordinate plane, a parabola opens up. It goes through (negative 6, 8)

solniwko [45]

Answer:To get the graph of the given parabola, we will use the equation of the parabola to check if given points in options are lying on that parabola or not. If they lie on the graph of parabola, then they would satisfy the equation, else not. We will use vertex form of parabola to get its vertex.

Thus, by below shown calculations, we have

Option A: On a coordinate plane, a parabola opens up. It goes through (-6, 0), has a vertex at (-2, -8), and goes through (2,0)

6 0

2 years ago

Find the geometric mean between each pair of numbers. 28 and 7

Viktor [21]

The answer is 14. You would get x to the second power and 196. Then you have to square root both sides and you would get x=14.

7 0

3 years ago

can you give a description of the relationship between the years since the tree was transplanted and its height in inches? if so

brilliants [131]

The relationship between the years since the tree was transplanted and its height in inches is linear and represented graphically by a line with positive slope and positive y-intercept

Step-by-step explanation:

Their is a linear relation between the years since the tree was transplanted and its height in inches because

The tree has a constant rate of increasing of its height per year
Assume that the initial height of the tree when it planted is b inches
Its height increases m inches per year
Its height (y) after x years can be expressed in the formula y = m x + b

y = m x + b is the form of the linear equation, where

m is the slope of the graph of the equation
b is the y-intercept (value y at x = 0)

The relationship between the years since the tree was transplanted and its height in inches is linear represented graphically by a line with positive slope and positive y-intercept

Learn more:

You can learn more about the linear functions in brainly.com/question/4152194

#LearnwithBrainly

4 0

4 years ago