Answer:
Whats the full question ?
Step-by-step explanation:
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
5/17 x 3/8 (a dot in sky means multiplication if you didn't know
lets break it down:
5 x 3=15
and
17 x 8=136
so the answer would be 15/136
Hope this helps