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ehidna [41]
3 years ago
6

The scores on a test given to all juniors in a school district are normally distributed with a mean of 72 and a standard deviati

on of 6. Find the probability that a randomly chosen junior has a score above 90. The probability of randomly choosing a junior whose score is above 90 is___%.
Mathematics
1 answer:
faust18 [17]3 years ago
8 0
30% is the correct  answer.
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Step-by-step explanation:

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What is the LCM of 7 and 13
lutik1710 [3]

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Step-by-step explanation:

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3 years ago
G a survey of property owners' opinions about a street-widening project was taken to determine if owners' opinions were related
Naily [24]

Answer:

The expected frequency for people against the project and who have over 120 feet of property foot frontage is 3.9.

Step-by-step explanation:

The data provided is:

                                                   Opinion    

Front Footage   For       Undecided Against    Total

Under 45 feet    12                4              4              20

  45-120 feet           35                5             30      70

Over 120 feet     3                2              5              10

       Total           50                11             39    100

The formula to compute the expected frequency is:

E(X)=\frac{\text{Row Total}\times \text{Column Total}}{\text{TOTAL}}

Compute the expected frequency for people against the project and who have over 120 feet of property foot frontage as follows:

E(X)=\frac{\text{Row Total}\times \text{Column Total}}{\text{TOTAL}}

E(5)=\frac{10\times 39}{100}=\frac{39}{10}=3.9

Thus, the expected frequency for people against the project and who have over 120 feet of property foot frontage is 3.9.

6 0
3 years ago
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