High School

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The weights of the melons harvested from a patch are distributed normally. The mean weight is 6 pounds; the standard deviation is 0.25 pounds.

Which is closest to the percent of melons that weigh 6.25 pounds or less?

A) 34
B) 68
C) 84
D) 98

Answer :

As it is normally distributed, we can use Z to find the result.

Procedure

0. Finding the value of ,Z

[tex]Z=\frac{x-\mu}{\sigma}[/tex]

1.2. Replacing the values given in the problem:

[tex]Z=\frac{6.25-6}{0.25}[/tex][tex]Z=\frac{0.25}{0.25}=1[/tex]

2. As it is normally distributed:

[tex]P(x\le6.25)=P(Z\le1)[/tex]

3. Using the normal standard table, we can conclude:

[tex]P(Z<1)=0.8413[/tex]

As it is asking for a percentage, we multiply by 100.

Answer: C) 84%

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