The lifespans of certain batteries are normally distributed. It is found that 15% of battery/less than 30 hours and 10% of batteries last more than 50 hours. Find the mean and standard deviation of the lifespan of the batteries

gaddgad

step-by-step explanation:

60

step-by-step explanation:

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).

can you complete your sentence? i could !