4x 1 1/5= write the product as a mixed number

Basically,

1. We convert the mixed number 1 1/5, into an improper fraction.

1 * 5 = 5 + 1 = 6/5

2. Then we multiply.

Convert 4 into a fraction, 4/1.

4/1 * 6/5 = 24/5

3. Convert into a mixed number.

5 * 4 = 20 R4

4 4/5

2.275%

Step-by-step explanation:

We solve this question using z score formula

z = (x-μ)/σ,

where

x is the raw score = 70 mph

μ is the population mean = 100 mph

σ is the population standard deviation = 15 mph

z score = 70 - 100/15

z score = -30/15

z score = - 2

Determining the Probability value from Z-Table:

P(x ≤ 70) = P(x < 70)

= P(z = -2)

= 0.02275

Hence the probability of the player's serve that are less than 70 mph is 0.02275

Converting it to percentage

= 0.02275 × 100

= 2.275%

Therefore, the percentage of the player's serve speeds that are less than 70 mph is = 2.275%