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Answer: 0.628
Step-by-step explanation:
Probability of U.S. smartphone owners have made an effort to limit their phone use in the past : p = 0.4702
Sample size : n= 54
Mean :
Standard deviation:
The probability that between 22 and 29 (inclusively) will have attempted to limit their cell phone use in the past will be :
Hence, the required probability = 0.628