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lisabon 2012 [21]
3 years ago
9

A set of biology exam scores are normally distributed with a mean of 70 points and a standard deviation of 6

Mathematics
2 answers:
Maslowich3 years ago
8 0

Answer:

To two decimal places, we have 0.93

Step-by-step explanation:

We start by calculating the z-score

Mathematically;

z-score = (x-mean)/SD

here, x = 61

mean = 70 and SD = 6

So, we have ;

z-score = (61-70)/6

z-score = -9/6 = -1.5

So we want to calculate the probability of z > -1.5

We use the standard normal distribution table for this

The answer here according to the table is 0.93319

To 2 decimal places, this is 0.93

bezimeni [28]3 years ago
7 0

Answer:

.69

Step-by-step explanation:

Normalcdf (lower: 0, upper: 73, mean: 70, S.D.: 6) = .691462 --> .69

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Step-by-step explanation:

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A área de um retângulo é igual a 44, sabendo que as suas medidas são iguais a 4 e (3x+2), calcule a medida do lado maior deste r
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Responda:

11

Explicação passo a passo:

Área do retângulo = comprimento * largura

Dado

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Largura = 3x + 2

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Substitua na fórmula e obtenha x

44 = 4 (3x + 2)

44 = 12x + 8

12x = 44-8

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4 0
3 years ago
Which is the simplified form of (9 c Superscript negative 9 Baseline) Superscript negative 3? 9 c Superscript 27 StartFraction 1
velikii [3]

Answer:

The correct option is B

B) (1/729)c²⁷

Step-by-step explanation:

Lets write it all in an understandable form.

The given expression is:

( 9c ⁻⁹ ) ⁻³

The given options are:

A)  9c²⁷

B) (1/729)c²⁷

C) 729c²⁷

D) 9/c²⁷

Lets find the solution. The given expression is:

( 9c ⁻⁹ ) ⁻³

Multiply the outer power -3 with each term inside the bracket. It can be rewritten as.

(9⁻³) ( c ⁽⁻⁹⁾⁽⁻³⁾)

A negative power can be converted into positive by taking it down in the denominator.

The multiplication (-9)(-3) results in 27.

The equation can be written as:

( 1/9³) ( c²⁷)

Where 9³ = 729

( 1/729)( c²⁷)

which is equal to option B

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