Enter all answers to the nearest tenth. Some of the following numbers will be used more than once and some may not be used.

A delivery driver has an average daily gasoline expense of $55.00. The standard deviation is $10.00. The owner takes a sample of 54 bills. What is the probability the mean of his sample will be between $45.00 and $65.00?

Step 1. Calculate the z-score for $45.00 = ??
Step 2. Give the probability for step 1= ?? %
Step 3. Calculate the z-score for $65.00. = ??
Step 4. Give the probability for step 3. = ??
Step 5. Add the probabilities from steps 1 & 3. = ??

Question

Enter all answers to the nearest tenth. Some of the following numbers will be used more than once and some may not be used.

A delivery driver has an average daily gasoline expense of $55.00. The standard deviation is $10.00. The owner takes a sample of 54 bills. What is the probability the mean of his sample will be between $45.00 and $65.00?

Step 1. Calculate the z-score for $45.00 = ??
Step 2. Give the probability for step 1= ?? %
Step 3. Calculate the z-score for $65.00. = ??
Step 4. Give the probability for step 3. = ??
Step 5. Add the probabilities from steps 1 & 3. = ??

anonymous · Answer

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