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Answer:
The adult male foot length of 24.3 cm is significantly low.
Step-by-step explanation:
We have been given that a group of adult males has foot lengths with a mean of 26.88 cm and a standard deviation of 1.13 cm. We are asked to find the range rule of thumb to determine whether he adult male foot length of 24.3 cm significantly low or significantly high.
The range rule of thumb states that usual values in a normal standard deviation lies within 2 standard deviation from mean that is , where
.
Let us find the range of possible values.
Since 24.3 is less than lower value of range (26.62), therefore, the adult male foot length of 24.3 cm is significantly low.