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denis-greek [22]
3 years ago
12

An english reading list has 9 american novels and 7 english novels. A student must read 5 from the list and at least 3 must be e

nglish novels. In how many different ways can the five books be selected combination
Mathematics
1 answer:
Elenna [48]3 years ago
7 0

_7C_3\cdot {_{13}C_2}=\dfrac{7!}{3!4!}\cdot\dfrac{13!}{2!11!}=\dfrac{5\cdot6\cdot7}{2\cdot3}\cdot\dfrac{12\cdot13}{2}=2730

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The weekly incomes of a large group of executives are normally distributed with a mean of $2,000 and a standard deviation of $10
8_murik_8 [283]

Answer:

The z-score for an income of $2,100 is 1.

Step-by-step explanation:

If X \sim N (µ, σ²), then  Z=\frac{x-\mu}{\sigma}, is a standard normal variate with mean, E (Z) = 0 and Var (Z) = 1. That is, Z \sim N (0, 1).

The distribution of these z-variate is known as the standard normal distribution.

Given:

µ = $2,000

σ = $100

<em>x</em> = $2,100

Compute the <em>z</em>-score for the raw score <em>x</em> = 2100 as follows:

Z=\frac{x-\mu}{\sigma}=\frac{2100-2000}{100}=\frac{100}{100}=1

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2 years ago
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dangina [55]

Answer:

D the answer is -40

Step-by-step explanation:

6 0
2 years ago
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80% of what number is 64
Thepotemich [5.8K]
Make an equation.

80% = 0.8

'of' is multiplication

'what number' is 'x'

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5 0
3 years ago
Carl and Nicole are raising money to purchase basketballs for their school's team. The more money they raise, the more basketbal
nata0808 [166]

Answer:

The amount of money raised

Step-by-step explanation:

The amount of basket balls depends on the money rasied and is therefore dependant, that leaves the money, which is completely independent.

3 0
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The model says a=.25t+29
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b) since 2015 is 45 yrs since 1960 we have
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3 0
2 years ago
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