Solution :
Given that ,
mean = = 271
standard deviation = = 25
n = 100
= 271
= / n = 25 / 100=2.5
P(271< <273 ) = P[(271 - 271) /2.5 < ( - ) / < (273 - 271) /2.5 )]
= P( 0< Z < 0.8)
= P(Z < 0.8) - P(Z <0 )
Using z table,
= 0.7881 - 0.5
=0.2881
QUESTION 12 Provide an appropriate response. Furnace repair bills are normally distributed with a mean of...
Furnace repair bills are normally distributed with a mean of 265 dollars and a standard deviation of 25 dollars. If 100 of these repair bills are randomly selected, find the probability that they have a mean cost between 265 dollars and 267 dollars. O 0.7881 O 0.2119 0.5517 O 0.2881
Furnace repair bills are normally distributed with a mean of 265 dollars and a standard deviation of 25 dollars. If 100 of these repair bills are randomly selected, find the probability that they have a mean cost between 265 dollars and 267 dollars. O 0.2119 O 0.2881 O 0.7881 O 0.5517
Furnace repair bills are normally distributed with a mean of 267 dollars and a standard deviation of 20 dollars. If 64 of these repair bills are randomly selected, find the probability that they have a mean cost between 267 dollars and 269 dollars. 0.5517 0.2119 0.2881 0.7881
13) Furnace repair bills are normally distributed with a mean of 265 dollars and a standard deviation of 20 dollars. If 64 of these repair bills are randomly selected, find the probability that they have a mean cost between 265 dollars and 267 dollars. A) 0.2119 B) 0.7881 C) 0.2881 D) 0.5517
Furnace repair bills are normally distributed with a mean of $273 & a standard deviation of $25. Examples of 100 furnace repair bills are obtained and the mean cost of each sample is recorded. Find the standard deviation of the mean costs. Write the formula you we use, then put the numbers into it then give the answer.
Provide an appropriate response. Assume that blood pressure readings are normally distributed with a mean of 117 and a standard deviation of 8.4. If 37 people are randomly selected, find the probability that their mean blood pressure will be more than 119. 0.0262 0.8615 0.0737 0.2819
QUESTION 10 Provide an appropriate response. Assume that blood pressure readings are normally distributed with a mean of 124 and a standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be less than 126. 0.8615 0.9998 0.9938 0.0062
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The monthly utility bills in a city are normally distributed with a mean of $100 and a standard deviation of $12 find the probability that a randomly selected utility bill is A) less than $69 B) between $90 and $100 and C) more than $110
Question 17 1 pts Provide an appropriate response. Assume that blood pressure readings are normally distributed with a mean of 124 and a standard deviation of 8. If 100 people are randomly selected, find the probability that their mean blood pressure will be less than 126. O 0.9998 O 0.8615 O 0.9938 0.0062