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Answer:
The standardized score (z-score), relative to all U.S. births, for a baby with a birth length of 45 centimeters is<u> 2.88cm . </u><u> </u>
Step-by-step explanation:
It is given that the mean length of the babies born after the 40 weeks gestation period is 52.2cm
Standard deviation = 2.5
Baby born on one month earlier having mean length = 47.4cm
Now , we will use the formula for z-score ,
= -2.88
<u>Therefore , A birth length of 45 centimeters is 2.88 below the mean standard deviation.</u>
Answer:
Step-by-step explanation:
In this problem we have a exponential function of the form
where
f(x) is the remaining mass of the element in grams
x is the time in minutes
a is the initial value (y-intercept of the exponential function)
b is the base
r is the rate
In this problem we have
---> is negative because is a decay's rate
substitute
The exponential function is equal to
For x=15 minutes
substitute in the function