Step-by-step explanation:
-5=q+2
-5+2=q
q= -3
hope it helps.
8-3x=5*2
8-3x=10
-3x=10-8
-3x=2
x=-2/3
Answer:
23.7
Step-by-step explanation:
Answer: 0.0228
Step-by-step explanation:
Given : The mean and the standard deviation of finish times (in minutes) for this event are respectively as :-

If the distribution of finish times is approximately bell-shaped and symmetric, then it must be normally distributed.
Let X be the random variable that represents the finish times for this event.
z score : 

Now, the probability of runners who finish in under 19 minutes by using standard normal distribution table :-

Hence, the approximate proportion of runners who finish in under 19 minutes = 0.0228