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John Beale of Stanford, CA, recorded the speeds of cars driving past his house, where the
speed
limit read 20 mph. The mean of 100 readings was 21.47 mph, with a standard
deviation of 4.39 mph. How many standard deviations from the mean would a car going
under the
speed limit be?
Answer to one decimal point. Your answer could be negative

Respuesta :

Answer:

Certainly! Let’s calculate how many standard deviations from the mean a car going under the speed limit of 20 mph would be:

Given:

Mean speed: 21.47 mph

Standard deviation: 4.39 mph

Speed limit: 20 mph

Calculate the z-score using the formula: [ z = \frac{{\text{{speed limit}} - \text{{mean speed}}}}{{\text{{standard deviation}}}} ] [ z = \frac{{20 - 21.47}}{{4.39}} = -0.3 ]

Therefore, a car going under the speed limit of 20 mph is approximately 0.3 standard deviations below the mean.

If you have any more questions or need further assistance, feel free to ask!

Step-by-step explanation:
heres the answer

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