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disa [49]
3 years ago
7

If the mean I.Q. is 100 and the standard deviation of I.Q. scores is 15, then an I.Q. of 130 will have a z score (or standard sc

ore) of ___________________.
Mathematics
1 answer:
skad [1K]3 years ago
7 0

Answer: I.Q. of 130 will have a z score (or standard score) of 2.

Step-by-step explanation:

Let X be a random variable that represents the  I.Q. score.

Formula for Z-score : Z=\dfrac{X-mean}{standard \ deviation}

As per given, mean I.Q. = 100 and the standard deviation =15

For X = 130,

Z=\dfrac{130-100}{15}=\dfrac{30}{15}=2

So, I.Q. of 130 will have a z score (or standard score) of 2.

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2 years ago
We randomize a sample for all the following reasons EXCEPT:
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Answer:

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Step-by-step explanation:

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Find the annual rate of interest. Principal = 4600 rupees Period = 5 years Total amount = 6440 rupees Annual rate of interest =
Semmy [17]

Answer:

The rate of interest for compounded annually is 6.96 %  .

Step-by-step explanation:

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<u>From compounded method</u>

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or, Rs 6440 = Rs 4600 × (1+\dfrac{\textrm R}{100})^{\textrm 5}

Or, \frac{6440}{4600} =  (1+\dfrac{\textrm R}{100})^{\textrm 5}

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or, 1.0696 =  1 + \dfrac{R}{100}

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5 0
3 years ago
Write the following list of events as an expression and then simplify.
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4 0
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49 is a multiple of 7 which too is a prime number so we can divide 49 by 7

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so 98 written as a product of prime factors is

98 = 2 x 7 x 7

4 0
3 years ago
Read 2 more answers
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