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jolli1 [7]
3 years ago
7

An electrical shop reduces display goods by 5% .A display TV is sold for £380. what is the usual price of the tv

Mathematics
2 answers:
vovikov84 [41]3 years ago
8 0

Answer:

£399

Step-by-step explanation:

personally its easier to find 1% first then multiply it by how many percent are needed to be found.

380/100=1%

380/100=3.8

3.8x5=5%

3.8x5=19

380+19=usual price

380+19=199

ivolga24 [154]3 years ago
3 0

Answer:

380-5%

Step-by-step explanation:

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Answer:

The probability that <em>X</em> is less than 42 is 0.1271.

Step-by-step explanation:

The random variable <em>X </em>follows a Normal distribution.

The mean and standard deviation are:

E (X) = <em>μ</em> = 50.

SD (X) = <em>σ</em> = 7.

A normal distribution is continuous probability distribution.

The Normal probability distribution with mean µ and standard deviation σ is given by,

f_{X}(\mu, \sigma)=\frac{1}{\sigma\sqrt{2\pi}}e^{-(x-\mu)^{2}/2\sigma^{2}};\ -\infty

To compute the probability of a Normal random variable we first standardize the raw score.

The raw scores are standardized using the formula:

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P(X

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Thus, the probability that <em>X</em> is less than 42 is 0.1271.

The normal curve is shown below.

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