Answer:
x= -3
Step-by-step explanation:
-x-3=x+3
-2x=6
x=-3
Answer:
The probability is
Step-by-step explanation:
From the question we are told that
The overall pass rate is
The sample size is n = 400
The percentage that passed is
Generally the standard error is mathematically represented as
=>
=>
Generally the probability of a simple random sample of 400 having a pass rate of 60% or less is mathematically represented as
=>
Generally from the z-table
So