3 years ago

Probability question (image included)

Mathematics

1 answer:

Alexandra [31]3 years ago

3 0

Answer:

Step-by-step explanation:

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The weight of people in a small town in missouri is known to be normally distributed with a mean of 154 pounds and a standard de

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If a random sample of 20 persons weighed 3,460, the sample mean x-bar would be 3460/20 = 173 pounds.
The z-score for 173 pounds is given by:
$z=\frac{173-154}{29}=0.655$
Referring to a standard normal distribution table, and using z = 0.66, we find:
$P(\bar x\ \textless \ 173)=0.7454$
Therefore
$P(\bar x\ \textgreater \ 173)=1-0.7454=0.2546$
The answer is: 0.2546

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3 years ago

Need help solving x

viva [34]

The coefficient of x in the equation is 1/(300 grams). Multiply by the reciprocal of that, which is (300 grams).

x = (300 grams)×(2 grams)/(100 grams) = (300×2/100) grams = 6 grams

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This is the way you solve any equation where x is multiplied by some value in the only term on one side of the equal sign.

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