Which is the best estimate for (8.9 x 10^8)/(3.3 x 10^4) written in scientific notation?

Mathematics

2 answers:

alexira [117]3 years ago

6 0

Answer:

3*10^4

Step-by-step explanation:

8.9/3.3 is about 3. 10^8/10^4 is 10^4.

Thus, the answer is about 3*10^4.

MrMuchimi3 years ago

4 0

Answer: C: 3 X 10^4

Step-by-step explanation:

Move the decimal so there is one non-zero digit to the left decimal. The number of decimal places you move will be the exponent on the 10. The sign of the exponent will depend on the direction you are moving the decimal. 2.69 (line over .69), therefore, round you get 3. = 3 x 10^4

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some psychologists believe that a genius should be defined as anyone having an IQ over 140. If IQ scores are normally distribute

denis23 [38]

Answer:

61,239,550

Step-by-step explanation:

We let the random variable X denote the IQ scores. This would imply that X is normal with a mean of 100 and standard deviation of 17. We proceed to determine the probability that an individual chosen at random from the population would be a genius, that is;

Pr( X>140)

The next step is to evaluate the z-score associated with the IQ score of 140 by standardizing the random variable X;

$Pr(X>140)=Pr(Z>\frac{140-100}{17})=Pr(Z>2.3529)$