Answer:
The percent of these mothers are between the ages 30-35 is 36.53%
Step-by-step explanation:
we are given
mean of age =31.7 years
standard deviation of 5.2 years
For age=30 years:
x=30
we can find z-score
we can plug values
For age=35 years:
x=35
we can find z-score
we can plug values
now, we can use normal distribution table
now, we can find percentage
=36.53%
Answer:
The probability that the middle school student owns a skateboard or a bicycle is 0.61.
Step-by-step explanation:
We are given that the probability of a middle school student owning a skateboard is 0.58, of owning a bicycle is 0.48, and owning both is 0.45.
A middle school student is chosen at random.
Let the probability of student owning a skateboard = P(S) = 0.58
The probability of student owning a bicycle = P(B) = 0.48
The probability of student owning both = P(S B) = 0.45
Now, the probability that the middle school student owns a skateboard or a bicycle is given by = P(S B)
P(S B) = P(S) + P(B) - P(S
B)
= 0.58 + 0.48 - 0.45
= 0.61
Hence, the probability that the middle school student owns a skateboard or a bicycle is 0.61.