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4 years ago

How many groups of 100 pennies are in 100 pennies

Mathematics

2 answers:

Anna71 [15]4 years ago

8 0

There is 1 group in 100 pennies.

maria [59]4 years ago

4 0

1.. 100 divided by 100 is 1.

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A marketing firm is considering making up to three new hires. Given its specific needs, the management feels that there is a 50%

IRISSAK [1]

Answer:

a) 0.9

b) Mean = 1.58

Standard Deviation = 0.89

Step-by-step explanation:

We are given the following in the question:

A marketing firm is considering making up to three new hires.

Let X be the variable describing the number of hiring in the company.

Thus, x can take values 0,1 ,2 and 3.

$P(x\geq 2) = 50\%= 0.5\\P(x = 0) = 10\% = 0.1\\P(x = 3) = 18\% = 0.18$

a) P(firm will make at least one hire)

$P(x\geq 2) = P(x=2) + P(x=3)\\0.5 = P(x=2) + 0.18\\ P(x=2) = 0.32$

Also,

$P(x= 0) +P(x= 1) + P(x= 2) + P(x= 3) = 1\\ 0.1 + P(x= 1) + 0.32 + 0.18 = 1\\ P(x= 1) = 1- (0.1+0.32+0.18) = 0.4$

$\text{P(firm will make at least one hire)}\\= P(x\geq 1)\\=P(x=1) + P(x=2) + P(x=3)\\ = 0.4 + 0.32 + 0.18 = 0.9$

b) expected value and the standard deviation of the number of hires.

$E(X) = \displaystyle\sum x_iP(x_i)\\=0(0.1) + 1(0.4) + 2(0.32)+3(0.18) = 1.58$

$E(x^2) = \displaystyle\sum x_i^2P(x_i)\\=0(0.1) + 1(0.4) + 4(0.32) +9(0.18) = 3.3\\V(x) = E(x^2)-[E(x)]^2 = 3.3-(1.58)^2 = 0.80\\\text{Standard Deviation} = \sqrt{V(x)} = \sqrt{0.8036} = 0.89$

7 0

3 years ago

The sum of a number and five is at least 5?

Juli2301 [7.4K]

Hello! For this type of problem, the sum is addition. Therefore, you add n and 5. The inequality for this question would be n + 5 >= 5. At least would mean a greater than or equal to symbol. If you need the answer as the value of n, n >= 0.

7 0

3 years ago

Can someone explain this i got 2 but I am really confused help me pls

Assoli18 [71]

Answer:

its either b or d im not sure sorry

Step-by-step explanation:

7 0

3 years ago

Read 2 more answers

What is k/5.9+ 58.9 = 35.6

mestny [16]

The 5.9+58.9= finding a calculator

3 0

2 years ago

56 less than the quotient of a number and 4 is -52

const2013 [10]

X - the number

The algebraic expression:
$\frac{x}{4}-56=-52$

The solution:
$\frac{x}{4}-56=-52 \ \ \ |+56 \\
\frac{x}{4}=4 \ \ \ |\times 4 \\
x=16$

3 0

3 years ago