Determine the sample size required to estimate a population mean to within 10 units given that the population standard deviation is 60. A confidence level of 90% is judged to be appropriate.

98

Step-by-step explanation:

Formula to find sample size if population standard deviation is known:

, where population standard deviation, =Critical z-value for confidence level, E= Margin of error.

Given:

Critical z-value for 90% confidence = 1.645

Required minimum sample size = 98

problem:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

f(5/2) = 10/3

i hope this !

(w – 2.5)(w + 2.5)

(–4v – 9)(–4v + 9)

step-by-step explanation: