Students in a middle school must choose to take either Band or Chorus. In a given academic year, 60% of the pupils choose Band a
1 answer:
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Answer: 0.5467
Step-by-step explanation:
We assume that the test scores for adults are normally distributed with
Mean :
Standard deviation :
Sample size : = 50
Let x be the random variable that represents the IQ test scores for adults.
Z-score :
For x =85
For x =115
By using standard normal distribution table , the probability the mean of the sample is between 95 and 105 :-
Hence, the probability that a randomly selected adult has an IQ between 85 and 115 =0.5467
Answer:
A perfect square is an integer that results in another integer when square rooted.
Step-by-step explanation:
For example:
16 is a perfect square because = 4.
16 and 4 are both integers
Also, notice that 4 x 4 = 16