Question

I ONLY NEED E. AND H. SOLVED. PLEASE DON'T TRY TO DO IT BY HAND, JUST TELL ME WHAT I NEED TO PUT IN THE CALCULATOR. EX: NORMALCDF( )  

Each sweat shop worker at a computer factory can put together 4.4 computers per hour on average with a standard deviation of 0.7 computers. 18 workers are randomly selected to work the next shift at the factory. Round all answers to 4 decimal places where possible and assume a normal distribution.

1. What is the distribution of XX? XX ~ N(,)
2. What is the distribution of ¯xx¯? ¯xx¯ ~ N(,)
3. What is the distribution of ∑x∑x? ∑x∑x ~ N(,)
4. If one randomly selected worker is observed, find the probability that this worker will put together between 4.2 and 4.4 computers per hour.
5. For the 18 workers, find the probability that their average number of computers put together per hour is between 4.2 and 4.4.
6. Find the probability that a 18 person shift will put together between 77.4 and 79.2 computers per hour.
7. For part e) and f), is the assumption of normal necessary? YesNo
8. A sticker that says "Great Dedication" will be given to the groups of 18 workers who have the top 15% productivity. What is the least total number of computers produced by a group that receives a sticker? minutes (round to the nearest computer)

Answer 1

For (e) the answer is .3873

Put .5- NORMLCDF(-1.21218)

For (f) the answer is 82

Put INVNORMALCDF(.85) get the value 1.03643 and solve for a.

In some calculator , you have to write INVERSENORMALCDF(.85) to get the value.

For further, query in above, comment.